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, COMSOL 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].