[bigger_cheese]

Engineering usage seems to match the physics usage. In classic engineering fashion however we were always taught just to 'plug them in' without learning all the minutia that go with them.

For example the stress and strain calculations which are used for calculating Deformation (Say if you were rolling a sheet of steel in a mill) makes use of tensors and also something called an "Invariant" I assume this also comes from Physics/Mathematics world.