# System of Units

MFIX-Exa adopts the International System of Units (SI). Simulations have to be set up accordingly. In the following table we provide a list of some of the physical quantities we can specify in the input file and their correspondent units.

Physical quantity | MFIX-Exa SI unit
--- | ---
amount of substance | mole [\(mol\)]
length | meter [\(m\)]
mass | kilogram [\(kg\)]
time | second [\(s\)]
force | Newton [\(N\)]
temperature | Kelvin [\(K\)]
pressure | Pascal [\(Pa\)]
energy | Joule [\(J\)]
power | Watt [\(W\)]
density | [\(kg \cdot m^{-3}\)]
velocity | [\(m \cdot s^{-1}\)]
dynamic viscosity | [\(Pa \cdot s\)]
diffusivity | [\(m^2 \cdot s^{-1}\)]
specific heat capacity | [\(J \cdot kg^{-1} \cdot K^{-1}\)]
thermal conductivity | [\(W \cdot m^{-1} \cdot K^{-1}\)]
spring coefficient | [\(N \cdot m^{-1}\)]
molecular weight | [\(kg \cdot mol^{-1}\)]
heat of formation | [\(J \cdot kg^{-1}\)]
reaction rate (Euler-Euler) | [\(mol \cdot m^{-3} \cdot s^{-1}\)]
reaction rate (Euler-Lagrange) | [\(mol \cdot s^{-1}\)]