Eq. (1.14), P = N m < vx2 >, where <.> means ``average'' (I don't know how to make an overline in html). Equivalently, you could use the velocity instead of the x-component with P = N m < v2 > /3, where <.> means ``average''
Yes, oddly enough. We'll learn why later.
Higher. U = (5/2) N k T for a diatomic molecule (assuming the bond isn't oscillating) and U = (3/2) N k T for a monatomic molecule.
When the bond begins to oscillate, which is usually much higher than room temperature, then there are 7 degrees of freedom instead of 5, so U = (7/2) N k T.
Back to the PHYS 317 home page.