Appendix D

1. Newton had postulated that when particles collide with a surface, they lose their normal component of velocity. If this were true, and a gas in contact with a wall had equilibrium random motion of particles $\left(\frac{1}{2}m\overline{{c}^{2}}=\frac{3}{2}kT\right)$, determine the relationship of wall pressure with number density (n) and temperature (T).

2. Pressure is related to the flux of momentum to a wall (area). Suppose that a wall material in contact with a gas reflected the molecules with ½ of the incoming normal $(\perp )$ velocity component. Evaluate the energy ...

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