Struggling With Internal Energy..

[Jack]

And temperature is kinetic energy of the moving molecules in a gas, right?
The higher the temp, the faster they're moving.
That's what I thought at least.

[Tom Booth]

Real gases will deviate from "ideal" near phase transition (very high pressure & low temperature). Then pressure and volume may need to be factored in, but generally speaking, I think, yes.

[Fool]

https://en.m.wikipedia.org/wiki/Van_der_Waals_equation