SI Base, Derived, and Other Units
The SI units form an internationally accepted system with seven units for base quantities and a large number of derived units. Use the symbols for these and other units when declaring units in COMSOL (for example, 10[m/s] uses the SI unit for velocity).
Table 3-8 lists the SI units for the seven base quantities.
Table 3-9 lists the SI derived units supported in COMSOL Multiphysics.
Table 3-10 lists additional units available in the COMSOL Multiphysics software regardless of the unit system in the model. If more than one name or symbol is available, use any of them, except when names contain more than one word or a hyphen. See also the tables with special units for other unit systems than the SI system; special units that are not listed in Table 3-10 are only available when using such non-SI unit systems.
Table 3-11 lists other SI derived units without special names or symbols.
Table 3-8: Base SI Units
Ω
10-6
10-7 J
10-5 N
10-10 m
103/(4·π) A/m
10-4 T
π/10800
π/648000
π/180
6.894757·106 Pa (1000 psi)
The fluid ounce is equal to 1/160 of an imperial gallon: 2.8413063·10-5 m3; that is, an imperial fluid ounce. You can refer to this unit using fluid_ounce (as the unit) or fl_oz (as the symbol).
The value of 1 inch of water is defined as the pressure exerted by one inch of water for a pure water density of 1000 kg/m3 at 4 degrees Celsius and standard gravity of 9.80665 m/s2. Refer to this unit using the symbol only (inH2O or inAq).
Millimeters water or millimeters, water gauge, is defined as the pressure exerted by one millimeter of water for a pure water density of 1000 kg/m3 at 4 degrees Celsius and standard gravity of 9.80665 m/s2. Refer to this unit using the symbol only (mmH2O).
This is the U.S. liquid gallon which equals 0.003785411784 m3; the Imperial (UK) gallon (imperialgallon, impgal) is equal to 0.00454609 m3.
m2
m-1
m3