British thermal unit

An energy unit defined as the amount of heat required to raise the temperature of one pound (pound-mass) of water by one degree from 60° to 61° Fahrenheit at a constant pressure of one atmosphere. Refer to the British thermal unit using the symbol only (Btu or BTU): for example, 0.28[Btu/(h*in*degF)] for a thermal conductivity.

calorie

Small calorie or gram calorie, which equals 4.184 J. A large calorie or kilogram calorie is 1000 calories (4.184 kJ). Use [kcal] for large calories.

fluid ounce

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).

kilopond

The kilopond (kp) or kilogram-force (kpf) is a gravitational metric unit of force. Refer to this unit using kilopond, kp, or kpf only.

kilopound per square inch

The kilopound per square inch (ksi) is a scaled pressure unit derived from psi (1 ksi is equal to 1000 psi). Refer to this unit using the symbol only (ksi).

millidarcy (mD)

Widely used for permeability in petroleum engineering. Typical values for the permeability of porous media are in the range of a few to a few hundred mD. The symbol D represents the debye, a unit for the magnetic dipole moment, and not the darcy unit.

mile

The international statute mile, which equals 1609.344 m.

nautimile

The nautical mile equals 1852 m.

ohm

To declare the SI unit for electric resistance, ohm, use [ohm]. The COMSOL Multiphysics software then displays this as Ω .

inches water

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

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).

knot

The same as nautical miles per hour.

year

A Gregorian year, which equals 365.2425 days.

gallon (gal)

This is the U.S. liquid gallon which equals 0.003785411784 m3; the Imperial (UK) gallon (imperialgallon, impgal) is equal to 0.00454609 m3.

pint and quart

The U.S. liquid pint and U.S. liquid quart, respectively.

rayl and rayl_cgs

The rayl (Rayl, Rayleigh) is a unit for the specific acoustic impedance. There are two variants, rayl, for MKS units, and rayl_cgs, for CGS units, where 1 rayl_cgs = 10 rayl. Refer to this unit the symbols only (rayl and rayl_cgs).