BIOPHYSICS UNITS

Heat transfer rate

J/s

Entropy

J/K

Temperature

Kelvin (K)

Force

Newtons (N)

Work

Joule (J)

Charge

Coulomb (C)

Electric potential

Volt = 1 J/C

Heat

Joule (J)

Volume

m^3

Pressure

1 Pascal (Pa)

Thermodynamic probability

Boltzmann constant

(1.38*10^-23) J/K

Plank's constant

J x s

Avogadro's number "molecules"

mol^-1

Mathematical probability

Information content

Binary digits (bit)

Latent heat of fusion

J/g

Number of microstates

Universal gas constant

J/mol x K

Electrochemical potential

J/mol

Enthalpy

Joule (J)

Concentration

mol/L

Electrical potential energy

Joule (J)

Helmotz free energy

Joule (J)

Amount of substance

mol

Particle number (N = nNA)

dimensionless

Flux of matter

Kg/m^2 x s

Concentration gradient

mol/L

Faraday's constant

C/mol or Cmol^-1

Coefficient of diffusion

m^2/s

Electrical mobility

m^2/V x s. (vd = uE)

Mobility of uncharged particles

s/Kg

Electric potential gradient

V/m

Absolute temperature

Kelvin (K)

Permeability coefficient

henries per meter (H/m), or equivalently in newtons per ampere squared (N/A^2)

Partition coefficient

no units

Membrane thickness

Angstrom (Å) or Nanometer (nm)

Constant of Michealis-Menten

mol/L

Hydrostatic pressure gradient

Pa/m

Osmotic pressure

Pa

Coefficient of filtration

Plasma viscosity

Pa x s

Diameter of a pore

Nanometer (nm)

Internal energy

J

Chemical potential

J/mol

Gibbs free energy

Joule (J)

Onsager coefficient

Depends on the flux:

1) J = Lx

2) L = J/x

Temperature gradient

K/m

Conductance

Siemens (S) = 1/Ω or Ω^-1

Resistance

Ohm (Ω)

Voltage

Volt (V)

Intensity of current

Ampere (A)

Permeability

Rate of heat flow

J/s