Recent content by txdw16

Formally, entropy is the irreversibly of a process or the lost ability to do useful work, and is often described as "disorder". A common example is a car engine. During the process the joints, pistons, air, fuel, etc. all lose useful energy due to friction, timing, and other "irreversibilities"...

I'm sure this has been asked before but it's annoying me. When we weigh ourselves is it in lbm or lbf? Because we weigh different on say, the moon, our weight must be lbf right? But if I weigh 150 any unit converter will say I weigh 68kg. Or do I weigh 2.13kg? Can I say I weigh 21 Newtons...

Okay thanks for the response that makes sense. But as far as the geometric meaning goes, what does γδxδyδz mean? In my head I think "The change in specific weight in any direction". But that phrase makes me think more along the lines of: \frac{\partial{\gamma}}{\partial{x}}\hat{i} +...

Hey all, I just started a fluid mechanics class and I'm having trouble interpreting the physical meaning behind differentials in this free body diagram. For example, γδxδyδz. I know gamma is the specific weight of the block of fluid. And I know δ is the differential length in x, y, or z...