Special British Engineering Units
The base units in the British engineering unit system are identical to the SI units with the following exceptions:
Table 3-12: Special Base Units in the British Engineering Unit System
Base quantity
name
symbol
length
foot
ft
mass
slug
N/A
temperature
Fahrenheit
degF
There is one derived unit that differs from the corresponding SI unit:
Table 3-13: Derived British Engineering Units in COMSOL
Derived quantity
name
symbol
force
pound-force
lbf
The British thermal unit is also available as Btu or BTU.
If the British engineering unit system is the base unit system, the COMSOL Multiphysics software constructs derived units from the applicable SI base units and the units listed in Table 3-12 and Table 3-13. This means, for example, that the unit for voltage displayed in the physics interface is lbf·ft/As rather than V (volt). In a text field that expects a voltage as input, you need to use the unit syntax when entering a numerical value, for example, 10[V].