True ABSORBED DOSE "For any ionising radiation, the mean energy imparted to an element of irradiated matter divided by the mass of this element" L2_PER_T2 m^2*s^-2 ABSORBED DOSE RATE D = dD/dt L2_PER_T3 m^2*s^-3 ACOUSTIC IMPEDANCE "At a surface, the complex representation of sound pressure divided by the complex representation of volume flow rate" M_PER_L4_T kg*m^-4*s^-1 Air Change Rate The frequency at which air within a room is being changed ONE_PER_T s^-1 FLOW L3_PER_T m^3*s^-1 FLOW FLOW_PER_CAPITA L3_PER_T m^3*s^-1 FLOW_PER_CAPITA Air flow per Capita Volume of air over time per person L3_PER_T m^3*s^-1 FLOW_PER_AREA l/(s*m^2) L_PER_T m*s^-1 FLOW_PER_AREA Flow Rate flow per area (l/(s*m^2)) m*s^-1 L_PER_T FLOW_RATE Air Flow Rate Air flow per area (l/s*m^2) m*s^-1 L_PER_T AMOUNT OF SUBSTANCE MOL mol ANGLE PER TIME An angular velocity that is the angular movement per a unit of time. PA_PER_T s^-1*rad ANGULAR ACCELERATION Rate of change of angle with time PA_PER_T2 s^-2*rad ANGULAR CROSS-SECTION "Cross-section for ejecting or scattering a particle into an element of solid angel, divided by this element. sigma = integral (sigma,omega domega)" L2_PER_SA m^2*sr^-1 ANGLE_PER_TIME ANGULAR FREQUENCY omega = 2.pi.f where f is the frequency PA_PER_T s^-1*rad MOMENT OF MOMENTUM The moment of momentum of a particle about a point is equal to the vector from this point to the particle and the momentum of the particle L = r x p M_L2_PER_T kg*m^2*s^-1 MOMENT_OF_MOMENTUM ANGULAR IMPULSE H = integral(M.dt) M_L2_PER_T kg*m^2*s^-1 ANGULAR REPETENCY k = 2.pi/lambda where lambda is the wavelength PA_PER_L m^-1*rad POWER Rate of energy transfer M_L2_PER_T3 kg*m^2*s^-3 POWER APPARENT POWER S = U.I M_L2_PER_T3 kg*m^2*s^-3 AREA A = double integral (dx.dy) where x and y are cartesian coordinates L2 m^2 STRESS M_PER_L_T2 kg*m^-1*s^-2 STRESS AREA FORCE M_PER_L_T2 kg*m^-1*s^-2 AREA AREA LARGE L2 m^2 AREA AREA MEDIUM L2 m^2 AREA MOMENT Moment of force per unit area M_PER_T2 kg*s^-2 SECOND MOMENT OF AREA "The second axial moment of area of a plane area (section) about an axis in its plane is the sum (integral) of the products of its elements of area and the squares of their distance from the axis. (I =Integral(r*r)dA, where r is the distance normal from the axis to the area element dA.)" L4 m^4 SECOND_MOMENT_OF_AREA AREA MOMENT OF INERTIA L4 m^4 DIMENSIONLESS A ratio that is a proportion between two rateable values. ONE one DIMENSIONLESS RATIO "A measure that is the relation between two similar magnitudes in respect to the number of times the first contains the second, integrally or fractionally." ONE one RATIO AREA PER AREA A ratio of an area concept to another area concept. ONE one AREA AREA SMALL L2 m^2 AREA SPRING CONSTANT M_PER_L2_T2 kg*m^-2*s^-2 AREIC CHARGE Charge divided by surface area T_EC_PER_L2 m^-2*s*A MASS M kg MASS ATOMIC WEIGHT Mass per atom of an element to 1/12 of the mass of an atom of the nuclide 12 C M kg MOMENT OF FORCE "The moment of force about a point is equal to the vector product of any radius vector from this point to a point on the line of action of the force, and the force M = r x F" M_L2_PER_T2 kg*m^2*s^-2 MOMENT_OF_FORCE BENDING MOMENT M_L2_PER_T2 kg*m^2*s^-2 BUCKLING RESISTANCE Resistance against buckling. L6 m^6 CALORIFIC VALUE MASS BASIS The quantity of thermal energy in a standard mass of the material. L2_PER_T2 m^2*s^-2 CAPACITANCE Charge divided by potential difference T4_EC2_PER_M_L2 kg^-1*m^-2*s^4*A^2 Carbon Dioxide Emission The mass of carbon dioxide emitted for a given amount of power T2_PER_L2 m^-2*s^2 CHARACTERISTIC IMPEDANCE OF A MEDIUM "At a point in a medium and for a plane progressive wave, the complex representation of sound pressure divided by the complex representation of particle velocity" M_PER_L2_T kg*m^-2*s^-1 CONCENTRATION MASS PER VOLUME M_PER_L3 kg*m^-3 CONCENTRATION_MASS_PER_VOLUME CHLORIDE CONTENT The average amount of Chloride reported in a number of samples. M_PER_L3 kg*m^-3 DIMENSIONLESS COEFFICIENT ONE one COEFFICIENT OF HEAT TRANSFER Areic heat flow rate divided by temperature difference M_PER_T3_K kg*s^-3*K^-1 RECIPROCAL TEMPERATURE ONE_PER_K K^-1 RECIPROCAL_TEMPERATURE COEFFICIENT OF THERMAL EXPANSION ONE_PER_K K^-1 COEFFICIENT COEFFICIENT SMALL ONE one COMPRESSIBILITY kappa = -(1/V).dV/dP L_T2_PER_M kg^-1*m*s^2 RATIO CONCENTRATION A ratio (often given in percent) of one type of substance in relation to a different type of substance in the same mixture. ONE one CONCENTRATION MOLE PER VOLUME A concentration given as moles per volume MOL_PER_L3 m^-3*mol CONDUCTANCE A ratio that is the ratio of the current in the conductor to the potential difference between its ends. Reciprocal of resistance. T3_EC2_PER_M_L2 kg^-1*m^-2*s^3*A^2 CONDUCTIVITY gamma = 1/rho T3_EC2_PER_M_L3 kg^-1*m^-3*s^3*A^2 COUPLING RATING A ratio which is the ratio between the power (KW) and the rotational frequency (100rpm) M_L2_PER_T4 kg*m^2*s^-4 COEFFICIENT CULVERT COEFFICIENT ONE one DIMENSIONLESS CURRENCY ONE one CURRENCY PER AREA ONE_PER_L2 m^-2 CURRENCY PER ENERGY T2_PER_M_L2 kg^-1*m^-2*s^2 RECIPROCAL LENGTH The reciprocal value of length. ONE_PER_L m^-1 RECIPROCAL_LENGTH CURRENCY PER LENGTH ONE_PER_L m^-1 CURRENCY PER POWER T3_PER_M_L2 kg^-1*m^-2*s^3 CURRENCY PER VOLUME ONE_PER_L3 m^-3 Currency Rate Cost per Time ONE_PER_T s^-1 VOLUME "V = triple integral (dx.dy.dz) where x, y and z are Cartesian coordinates" L3 m^3 VOLUME DAILY FLARED GAS VOLUME - MSCF A daily flared gas volume that is measured in thousand standard cubic feet. L3 m^3 DAMPING COEFFICIENT If the quantity is a function of time given by F(t) = A.e^- (delta.t).cos[omega.(t - t0)] then delta is the damping coefficient M_PER_T kg*s^-1 CONCENTRATION_MASS_PER_VOLUME DENSITY Mass divided by volume. M_PER_L3 kg*m^-3 CONCENTRATION_MASS_PER_VOLUME DENSITY GAS Mass per unit volume of a gas. M_PER_L3 kg*m^-3 DENSITY OF STATES "rho(E) = N,E(E) = dN(E)/dE where n(E) is the total number of one-electron states with energy less than E, divided by volume" T2_PER_M_L5 kg^-1*m^-5*s^2 LENGTH L m LENGTH DEPTH L m DEPTH DEPTH LARGE L m DEPTH DEPTH SMALL L m LENGTH DIAMETER L m DIAMETER DIAMETER LARGE L m DIAMETER LENGTH The diameter of a pipe multiplied by its length. Used to estimate the infiltration rate proportional to the product of its diameter and length. L2 m^2 DIAMETER DIAMETER SMALL L m DIAMETER DIAMETER VERY SMALL L m DIFFUSIVITY L2_PER_T m^2*s^-1 DISCHARGE PER PRESSURE DROP SQRT_L7_PER_SQRT_M kg^-0.5*m^3.5 VOLUME DISPLACEMENT L3 m^3 ABSORBED_DOSE DOSE EQUIVALENT "Product of D, Q and N, at the point of interest in tissue, where D is the absorbed dose, Q is the quality factor and N is the product of any other modifying factors H = D.Q.N" L2_PER_T2 m^2*s^-2 ELECTRIC CHARGE Integral of electric charge over time T_EC s*A ELECTRIC CURRENT A measure for the flow rate of electrical energy. Electric current is one of the base quantities on which the SI system is based. EC A ELECTRIC CURRENT DENSITY "Vector quantity, the integral of which over a given surface is equal to the electric current flowing through that surface" EC_PER_L2 m^-2*A ELECTRIC DIPOLE MOMENT "Vector quantity, the vector product at which with the electric field strength of a homogenous field is equal to the torque pxE = T" L_T_EC m*s*A ELECTRIC FIELD STRENGTH "Force, exerted by electric field on an electric point charge, divided by the electronic charge" M_L_PER_T3_EC kg*m*s^-3*A^-1 ELECTRIC POLARIZABILITY OF MOLECULE Induced electric dipole moment divided by electric field strength T4_EC2_PER_M kg^-1*s^4*A^2 ELECTRIC POTENTIAL "For electrostatic fields, a scalar quantity, the gradient of which, with reversed sign, is equal to the electric field strength E = - grad V" M_L2_PER_T3_EC kg*m^2*s^-3*A^-1 ELECTRICAL RESISTANCE "In electrical and acoustical fields, the real part of the impedance characterised by the dissipation of energy as opposed to its storage. Electrical resistance may vary with temperature, polarity, field illumination, purity of materials etc. Reciprocal of conductance." M_L2_PER_T3_EC2 kg*m^2*s^-3*A^-2 ELECTRICAL RESISTANCE PER LENGTH M_L_PER_T3_EC2 kg*m*s^-3*A^-2 ELECTRIC_POTENTIAL ELECTROMOTIVE FORCE Energy supplied by a source divided by the electrical charge transported through the source M_L2_PER_T3_EC kg*m^2*s^-3*A^-1 LENGTH ELEVATION L m ENERGY Capacity to do work. M_L2_PER_T2 kg*m^2*s^-2 ENERGY FLUENCE "At a given point in space, the sum of the energies, exclusive of the rest energy, of all the particles incident on a small sphere, divided by the cross-sectional area of that sphere" M_PER_T2 kg*s^-2 POWER PER AREA A property expressing power per unit area. M_PER_T3 kg*s^-3 POWER_PER_AREA ENERGY FLUENCE RATE psi = dPSI/dt M_PER_T3 kg*s^-3 ENERGY PER UNIT VOLUME M_PER_L_T2 kg*m^-1*s^-2 ENTHALPY M_L2_PER_T2 kg*m^2*s^-2 ENTROPY "When a small quantity of heat dQ is received by a system the thermodynamic temperature of which is T, the entropy of the system is increased by ddQ/dT, provided that no irreversible change takes place in the system" M_L2_PER_T2_K kg*m^2*s^-2*K^-1 EQUIVALENT PER MASS A concept of property that is an equivalent divided by mass. ONE_PER_M kg^-1 EXPOSURE "For X-gamma radiation, the total electric charge of the ions of the same sign produced when all the electrons (negative and positive) liberated by photons in an element of air are stopped in air, divided by the mass of that element" T_EC_PER_M kg^-1*s*A EXPOSURE RATE Xr = dX/dt EC_PER_M kg^-1*A FARADAY CONSTANT F = NA.e T_EC_PER_MOL s*A*mol^-1 FIRST RADIATION CONSTANT "The constant c1 and c2 in the expression for the spectral concentration of the radiant exitance of a full radiator (black body) at the thermodynamic temperature T M = c1.f(lambda,T) = c1.lambda^5/(e^(c2/(lambda.T))-1)" M_L4_PER_T3 kg*m^4*s^-3 DEPTH FLOW DEPTH L m FLOW FLOW TOLERANCE L3_PER_T m^3*s^-1 FORCE The resultant force acting on a body is equal to the derivative with respect to time of the momentum of the body M_L_PER_T2 kg*m*s^-2 FORCE PER VOLUME Force acting on a thing by unit volume. M_PER_L2_T2 kg*m^-2*s^-2 RATIO FRACTION ONE one RECIPROCAL_TIME ONE_PER_T s^-1 RECIPROCAL_TIME FREQUENCY f = 1/T where T is a period Number of cycles divided by time (ISO 31-5:1992(E)) ONE_PER_T s^-1 GYROMAGNETIC COEFFICIENT gamma = mu.2.pi/(J.h) where J is the angular momentum quantum number T_EC_PER_M kg^-1*s*A HALL COEFFICIENT "In an isotropic conductor, the relation between electric field strength E and the current density J is E = rho.J + R(BxJ) where rho is the resistivity and B is the magnetic flux density" L3_PER_T_EC m^3*s^-1*A^-1 Hazen-Williams ONE one DEPTH HEADLOSS L m Heat Transfer The transition of thermal energy from an area of higher concentration to one of lower concentration M_L2_PER_T3_K kg*m^2*s^-3*K^-1 COEFFICIENT_OF_HEAT_TRANSFER HEAT TRANSFER COEFFICIENT AT CLEAN CONDITIONS A heat transfer coefficient at clean conditions. M_PER_T3_K kg*s^-3*K^-1 LENGTH Height L m HYDRAULIC CONDUCTIVITY L_PER_T m*s^-1 ILLUMINANCE "At a point on a surface, the luminous flux incident on an element of the surface, divided by the area of that element" LF_PER_L2 m^-2*cd*sr MOMENTUM Product of mass and velocity. M_L_PER_T kg*m*s^-1 MOMENTUM IMPULSE I=integral F.dt M_L_PER_T kg*m*s^-1 INTRINSIC NUMBER DENSITY n.p = ni^2 where n is the neutron number density and p the hole number density ONE_PER_L3 m^-3 IONIC STRENGTH The ionic strength of a solution is defined as I = (1/2) .sum(zi2.mi) where the summation is carried out over all ions with molarities mi MOL_PER_M kg^-1*mol KINEMATIC VISCOSITY L2_PER_T m^2*s^-1 Kutters ONE one AREA LAND AREA L2 m^2 LENGTH LENGTH LONG L m RATIO LENGTH PER LENGTH A ratio of a length concept to another length concept. ONE one LENGTH PER MASS "Length of an constant crossection shaped object per unit of mass; as profile, string etc." L_PER_M kg^-1*m LENGTH LENGTH SHORT L m LEVEL OF A POWER QUANTITY "Lp = ln (P/Po) where P and Po represent two powers, Po being a reference power" ONE one LIGHT EXPOSURE H = integral (E dt) where E is the illuminance T_LF_PER_L2 m^-2*s*cd*sr Lighting Heat Gain M_PER_T3 kg*s^-3 The heat gained caused by room lighting LINEAR ACCELERATION "An acceleration which is the rate of change of velocity with respect to time, given in units of length per time squared." L_PER_T2 m*s^-2 LINEAR ELECTRIC CURRENT DENSITY Electric current in a conducting sheet divided by the width of the sheet EC_PER_L m^-1*A FORCE LINEAR ENERGY TRANSFER "For an ionising charged particle, the energy imparted locally to matter in traversing a small distance through the matter, divided by that distance" M_L_PER_T2 kg*m*s^-2 LINEAR FORCE M_PER_T2 kg*s^-2 FORCE LINEAR MOMENT M_L_PER_T2 kg*m*s^-2 LINEAR PER ANGULAR L_PER_PA m*rad^-1 LINEAR ROTATIONAL SPRING CONSTANT M_L_PER_T2_PA kg*m*s^-2*rad^-1 LINEAR SPRING CONSTANT M_PER_L_T2 kg*m^-1*s^-2 LINEIC MASS Mass divided by length. M_PER_L kg*m^-1 LOGARITHMIC MEASURE ONE one LORENZ COEFFICIENT "L = lambda/(sigma.T) where lambda is the thermal conductivity, sigma the electrical conductivity and T is the thermodynamic temperature" M2_L4_PER_T6_EC2_K2 kg^2*m^4*s^-6*A^-2*K^-2 TIME T s TIME LOWER LIMIT OF OUTDOOR STORAGE A period of time which is the lower limit of outdoor storage. T s LUMINANCE "At a point on a surface and in a given direction, the luminous intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction" LI_PER_L2 m^-2*cd LUMINOUS EFFICACY K = PHIv/PHIe T3_LF_PER_M_L2 kg^-1*m^-2*s^3*cd*sr LUMINOUS FLUX The luminous flux d PHI of a source of luminous intensity I in an element of solid angle dOMEGA is given by d(PHI) = I.d(OMEGA) LF cd*sr LUMINOUS INTENSITY LI cd MAGNETIC FIELD STRENGTH "Vector quantity, the rotation (curl) of which is equal to the sum of the electric current density and the time derivative of the electric flux density" EC_PER_L m^-1*A MAGNETIC FLUX "Across a surface element, the scalar product of the magnetic flux density and the surface element" M_L2_PER_T2_EC kg*m^2*s^-2*A^-1 MAGNETIC INDUCTION Vector quantity such that the force exerted on an element of electric current is equal to the vector product of this element and the magnetic flux density M_PER_T2_EC kg*s^-2*A^-1 MAGNETIC MOMENT "Vector quantity, the vector product of which with the magnetic flux density of a homogenous field is equal to the torque mxB = T" EC_L2 m^2*A MAGNETIC VECTOR POTENTIAL "Vector quantity, the rotation (curl) of which is equal to the magnetic flux density. B = rot A" M_L_PER_T2_EC kg*m*s^-2*A^-1 Mannings ONE one MASS ATTENUATION COEFFICIENT "The linear attenuation coefficient divided by the volumetric mass of the substance mu, m = mu/rho" L2_PER_M kg^-1*m^2 MASS RATE M_PER_T kg*s^-1 MASS_RATE MASS FLOW RATE Mass of matter which crosses a given surface divided by time. M_PER_T kg*s^-1 MASS MOMENT OF INERTIA Moment of inertia of a body about an axis is the sum (integral) of the product of its elements of mass and the square of their distances from the axis. I = Integral (r*r*)dm; where r is the distance from the mass element 'm' to the axis. M_L2 kg*m^2 MASS PER AREA M_PER_L2 kg*m^-2 MASSIC ACTIVITY Activity divided by the total mass of the sample ONE_PER_T_M kg^-1*s^-1 MASSIC OPTICAL ROTATORY POWER alpha m = alpha.A/m where m is the mass of the optically active component in the path of the linearly polarized light beam of cross-sectional area A L2_PA_PER_M kg^-1*m^2*rad MECHANICAL IMPEDANCE "at a surface (or at a point), the complex representation of total force divided by the complex representation of average particle velocity at that surface (or of particle velocity at that point) in the direction of the force" M_PER_T kg*s^-1 MOBILITY "Average drift velocity imparted to a charged particle in a medium by an electric field, divided by the field strength" T2_EC_PER_M kg^-1*s^2*A MOLAR ATTENUATION COEFFICIENT "mu,c = mu/rho where c is the amount-of-substance concentration" L2_PER_MOL m^2*mol^-1 MOLAR CONDUCTIVITY Conductivity divided by the amount-of-substance concentration T3_EC2_PER_M_MOL kg^-1*s^3*A^2*mol^-1 MOLAR ENTROPY Entropy divided by amount of substance M_L2_PER_T2_K_MOL kg*m^2*s^-2*K^-1*mol^-1 MOLAR MASS Mass divided by amount of substance M = m/n M_PER_MOL kg*mol^-1 MOLAR OPTICAL ROTATORY POWER alpha = alpha.A/n where n is the amount of substance of the optically active component in the path of a linearly polarized light beam of a cross-sectional area A L2_PA_PER_MOL m^2*mol^-1*rad MOLAR THERMODYNAMIC ENERGY Thermodynamic energy divided by amount of substance M_L2_PER_T2_MOL kg*m^2*s^-2*mol^-1 MOLAR VOLUME Volume divided by amount of substance Vm = V/n L3_PER_MOL m^3*mol^-1 NEUTRON SOURCE DENSITY "Rate of production of neutrons in a volume element, divided by that element" ONE_PER_L3_T m^-3*s^-1 DIMENSIONLESS NONE ONE one MASS_RATE NORMAL MASS FLOW RATE A mass flow rate that is the expected flow. M_PER_T kg*s^-1 OXYGEN-CONTENT IN TREATED PRODUCED WATER - PPB (PPB=??? Evnt: Skal OXYGEN-CONTENT IN TREATED PRODUCED WATER opprettes f rst??) A measure describing the content of oxygen in produced water that has been processed in the water cleaning system on the installation. ONE one PARTICLE FLUENCE "At a given point in space, the number of particles incident on a small sphere, divided by the cross-section area of that sphere" ONE_PER_L2 m^-2 PARTICLE FLUENCE RATE phi = dPHI/dt ONE_PER_L2_T m^-2*s^-1 RATIO PERCENT ONE one TIME PERIOD Time of one cycle T s PERMEABILITY M_L_PER_T2_EC2 kg*m*s^-2*A^-2 PERMEANCE LAMBDA = 1/Rm where Rm is the reluctance M_L2_PER_T2_EC2 kg*m^2*s^-2*A^-2 PERMITTIVITY D = epsilon.E where D is the electric flux density and E is the electric field strength T4_EC2_PER_M_L3 kg^-1*m^-3*s^4*A^2 PHOTON INTENSITY "In a given direction from a source, the photon flux leaving the source, in an element of solid angle containing the given direction, divided by that element of solid angle" ONE_PER_T_SA s^-1*sr^-1 PARTICLE_FLUENCE_RATE PHOTON IRRADIANCE "At a point on a surface, the photon flux incident on an element of the surface, divided by the area of that element" ONE_PER_L2_T m^-2*s^-1 PHOTON LUMINANCE "At a point on a surface and in a given direction, the photon intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction" ONE_PER_L2_T_SA m^-2*s^-1*sr^-1 DIMENSIONLESS SLOPE ONE one SLOPE PIPE SLOPE ONE one PLANE ANGLE An angle between two half-lines terminating at the same point is defined as the ratio of length of the included arc of the circle (with its centre at that point) to the radius of that circle PA m*m^-1 POLYTROPIC HEAD A head that is used to calculate the horsepower. L2_PER_T2 m^2*s^-2 DIMENSIONLESS POPULATION ONE one POPULATION PER AREA ONE_PER_L2 m^-2 STRESS PRESSURE Force perpendicular to the area divided by area. p = dF/dA where dF is the perpendicular component of the force acting on the area element dA. The pressure is positive when the force is acting into the area. M_PER_L_T2 kg*m^-1*s^-2 PRESSURE COEFFICIENT beta = dp/dT where p is the pressure and T is the temperature M_PER_L_T2_K kg*m^-1*s^-2*K^-1 DEPTH PRESSURE HEAD L m PROFILE SURFACE AREA PER UNIT OF LENGTH An area that is an outside area of a profile pr. unit of length. L m PROFILE SURFACE AREA PER UNIT OF MASS An area which is an outside area of a profile pr. unit of mass L2_PER_M kg^-1*m^2 QUANTITY OF LIGHT Time integral of luminous flux T_LF s*cd*sr RADIANCE "At a point on a surface and in a given direction, the radiant intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction" M_PER_T3_SA kg*s^-3*sr^-1 ENERGY_PER_UNIT_VOLUME RADIANT ENERGY DENSITY Radiant energy in an element of volume; divided by that volume M_PER_L_T2 kg*m^-1*s^-2 RADIANT INTENSITY "in a given direction from a source, the radiant energy flux leaving the source, or an element of the source, in an element of the solid angle containing the given direction, divided by that element of solid angle" M_L2_PER_T3_SA kg*m^2*s^-3*sr^-1 RADIATION ACTIVITY "Average number of spontaneous nuclear transitions from a particular energy state occurring in an amount of a radionuclide in a small time interval, divided by that interval" ONE_PER_T s^-1 reactive power M_L2_PER_T3 kg*m^2*s^-3 RECIPROCAL AREA ONE_PER_L2 m^-2 RECIPROCAL VOLUME ONE_PER_L3 m^-3 RATIO RELATIVE FLOW CHANGE ONE one RELUCTANCE Magnetic potential difference by magnetic flux T2_EC2_PER_M_L2 kg^-1*m^-2*s^2*A^2 RESISTIVITY E = rho.J Electrical resistance of a material multiplied by the ratio of cross sectional area to current path length. M_L3_PER_T3_EC2 kg*m^3*s^-3*A^-2 RICHARDSON CONSTANT "The thermionic emission current density J for a metal is J = A.T^2.exp(-PHI/(k.T)) where T is the thermodynamic temperature, k is the Boltzmann constant and PHI is the work function" EC_PER_L2_K2 m^-2*A*K^-2 ANGLE_PER_TIME ROTATIONAL SPEED The number of 360 degree revolutions of a shaft per unit time PA_PER_T s^-1*rad ROTATIONAL SPRING CONSTANT M_L2_PER_T2_PA kg*m^2*s^-2*rad^-1 DEPTH ROUGHNESS L m ROUGHNESS ROUGHNESS ABSOLUTE L m ROUGHNESS ROUGHNESS DARCYWEISBACH L m ROUGHNESS ROUGHNESS HAZENWILLIAMS Deprecated - Use 'HAZEN_WILLIAMS_ROUGHNESS' L m ROUGHNESS ROUGHNESS KUTTERS Deprecated - Use KUTTERS_ROUGHNESS L m ROUGHNESS ROUGHNESS MANNINGS Deprecated - Use MANNINGS_ROUGHNESS L m RATIO SCALE ONE one SECOND RADIATION CONSTANT "The constant c1 and c2 in the expression for the spectral concentration of the radiant exitance of a full radiator (black body) at the thermodynamic temperature T M = c1.f(lambda,T) = c1.lambda^5/(e^(c2/(lambda.T))-1)" L_K m*K SLOPE SIDE SLOPE ONE one SLOWING-DOWN DENSITY "Number density of neutrons slowing down past a given energy value in a small time interval, divided by that interval" ONE_PER_L3_T m^-3*s^-1 SOLID ANGLE A solid angle of a cone is defined as the ratio of the area cut out on a spherical surface (with its centre at the apex of that cone) to the square of the radius of the sphere SA m^2*m^-2 LOGARITHMIC_MEASURE SOUND PRESSURE LEVEL ONE one SOUND_PRESSURE_LEVEL SOUND PRESSURE LEVEL ALLOWED A sound pressure level that is the allowed sound pressure level. ONE one SOUND_PRESSURE_LEVEL SOUND PRESSURE LEVEL AT NOMINAL LOAD A sound pressure level that is the sound pressure level generated when operating at nominal load. ONE one SPECIFIC ENERGY Energy divided by mass L2_PER_T2 m^2*s^-2 SPECIFIC ENTROPY Entropy divided by mass L2_PER_T2_K m^2*s^-2*K^-1 RATIO SPECIFIC GRAVITY ONE one SPECIFIC HEAT CAPACITY Heat capacity divided by mass L2_PER_T2_K m^2*s^-2*K^-1 SPECIFIC VOLUME Volume divided by mass. v=1/rho L3_PER_M kg^-1*m^3 FORCE_PER_VOLUME SPECIFIC WEIGHT M_PER_L2_T2 kg*m^-2*s^-2 SPECTRAL ANGULAR CROSS-SECTION "Cross-section for ejection or scattering a particle into an element of solid angle with energy in an element of energy, divided by the product of these two elements sigma = double integral (sigma, OMEGA, E.dOMEGA.dE)" T2_PER_M_SA kg^-1*s^2*sr^-1 SPECTRAL CONCENTRATION OF RADIANT ENERGY DENSITY "Radiant energy density in an infinitesimal wavelength interval, divided by the range of that interval" M_PER_L2_T2 kg*m^-2*s^-2 SPECTRAL CONCENTRATION OF VIBRATIONAL MODES "Number of vibrational modes in an infinitesimal interval of angular frequency, divided by the size of that interval and by volume" T_PER_L3_PA m^-3*s*rad^-1 SPECTRAL CROSS-SECTION "Cross-section for a process in which the energy of the ejected or scattered particle is in an element of energy, divided by this element. sigma = integral ( sigmaE.dE)" T2_PER_M kg^-1*s^2 SPRING CONSTANT M_PER_T2 kg*s^-2 RATIO STRAIN length per length ONE one MASS_PER_AREA SURFACE DENSITY Mass divided by area M_PER_L2 kg*m^-2 LINEAR_FORCE SURFACE TENSION Force perpendicular to a line element in a surface divided by the length of the line element M_PER_T2 kg*s^-2 VOLUME TANK VOLUME L3 m^3 TEMPERATURE The degree or intensity of heat or cold as measured on a thermometric scale, and a measure of whether two systems are relatively hot or cold with respect to one another. Two systems brought into contact will, after sufficient time, be in thermal equilibrium and will have the same temperature. K K TEMPERATURE CHANGE The change in the degree or intensity of heat or cold as measured on a thermometric scale. K K TEMPERATURE GRADIENT temperature change per length K_PER_L m^-1*K Thermal Admittance Equal to the Coefficient of heat transfer M_PER_T3_K kg*s^-3*K^-1 THERMAL CONDUCTANCE G = 1/R where R is the thermal resistance M_L2_PER_T3_K kg*m^2*s^-3*K^-1 THERMAL CONDUCTIVITY Areic heat flow rate divided by temperature gradient M_L_PER_T3_K kg*m*s^-3*K^-1 THERMAL INSULANCE Temperature difference divided by areic heat flow rate M = 1/K T3_K_PER_M kg^-1*s^3*K THERMAL RESISTANCE Temperature difference divided by heat flow rate. T3_K_PER_M_L2 kg^-1*m^-2*s^3*K Thermal Transmittance The rate of heat transfer through one square meter of material divided by the difference in temperature across the material kg*s^-3*K^-1 M_PER_T3_K THOMSON COEFFICIENT Thomson heat power developed divided by the electric current and temperature difference M_L2_PER_T3_EC_K kg*m^2*s^-3*A^-1*K^-1 TIME TIME EXTENDED T s TIME TIME FLOW T s TIME TIME LONG T s TIME TIME SHORT T s TIME TIME VERY SHORT T s MOMENT_OF_FORCE TORQUE M_L2_PER_T2 kg*m^2*s^-2 TOTAL ATOMIC STOPPING POWER Sa = S/n where n is the number density of the atoms in the substance M_L4_PER_T2 kg*m^4*s^-2 TOTAL MASS STOPPING POWER Total linear stopping power divided by the volumetric mass of the substance Sm = S/rho L4_PER_T2 m^4*s^-2 Vapor Resistance The vapor pressure difference per unit times rate of water vapor steady-state flow through a unit area, normal to specific parallel surfaces. Often measured in GNs/kg. L_PER_T m*s^-1 Vapor Resistivity ONE_PER_T s^-1 Resistance per unit thickness to water vapor. Often measured in GNs/(kg*m). VELOCITY v = ds/dt where s is the displacement and t is the time L_PER_T m*s^-1 VISCOSITY Dynamic Viscosity. tau xz= eta (delta(vx)/delta(z)) where tau xz is the shear stress (shear force pr. unit area) in a fluid moving with a velocity gradient dvx/dz perpendicular to the plane of shear. M_PER_L_T kg*m^-1*s^-1 ELECTRIC_POTENTIAL VOLTAGE M_L2_PER_T3_EC kg*m^2*s^-3*A^-1 FLOW VOLUME FLOW RATE "A flow rate which is the volume of matter that crosses a given surface divided by time. (instantaneous rate of volume flow due to a sound wave, ISO 31-7:1992(E))" L3_PER_T m^3*s^-1 VOLUME VOLUME LARGE L3 m^3 RATIO VOLUME PER VOLUME A ratio of a volume concept to another volume concept. ONE one PERCENT VOLUME PERCENTAGE A percentage of the volume occupied by a component to the total volume of the system. ONE one VOLUME VOLUME SMALL L3 m^3 VOLUMIC ACTIVITY Activity divided by the total volume of the sample ONE_PER_L3_T m^-3*s^-1 VOLUMIC CHARGE Charge divided by volume T_EC_PER_L3 m^-3*s*A FLOW WATER VOLUME FLOW RATE A water volume flow rate measured in standard cubic metre per day. L3_PER_T m^3*s^-1 PERCENT WEIGHT PERCENTAGE A percentage where the calculation is based on a ratio between weights. ONE one WEIR COEFFICIENT L3 m^3 LENGTH WIDTH L m WOBBE INDEX The Wobbe Index is a number indicating the interchangeability of fuel gases. The value is obtained by dividing the heating value of a gas by the square root of its specific gravity. M_PER_L_T2 kg*m^-1*s^-2 STRESS YIELD STRENGTH M_PER_L_T2 kg*m^-1*s^-2 STRESS YOUNGS MODULUS M_PER_L_T2 kg*m^-1*s^-2