Physics

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 * Physics, not metaphysics

Really you should just use the internet to figure stuff out in this realm, but I'm noting some things down because I want to put them somewhere

When doing math with linear relationships (or maybe other situations) differentation between variables and units. e.g. 10 miles (m) per hour (h) with variables/values (v) which contain units, and units (u): mv = 10*(mu/hu)*hv