$UnitSystem
$UnitSystem
gives the unit system to assume for returned quantities.
Examples
Wolfram Research (2014), $UnitSystem, Wolfram Language function, https://reference.wolfram.com/language/ref/$UnitSystem.html.
Text
Wolfram Research (2014), $UnitSystem, Wolfram Language function, https://reference.wolfram.com/language/ref/$UnitSystem.html.
CMS
Wolfram Language. 2014. "$UnitSystem." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$UnitSystem.html.
APA
Wolfram Language. (2014). $UnitSystem. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$UnitSystem.html