You thought they were interchangeable? Think again.
If you find yourself in a conversation involving the technical aspect of cars, there are bound to be a large number of units of measurement being thrown around - tire width in millimeters, engine output in horsepower ... talking car gear can occasionally turn into a numbers game. When talking about torque, most people tend to swap the order of the units, calling it both pound-feet and foot-pounds, maybe even in the same breath. Most people think that this is totally fine. Guess what? It's not.