15.3.2—How molecular movement causes the pressure exerted by a gas and derive and

Molecules colliding with a wall change momentum; the rate of momentum transfer per unit area produces macroscopic pressure.

More frequent or harder collisions raise pressure. Increasing temperature raises average molecular kinetic energy and therefore collision impulses and rates.

Compressing a gas at fixed temperature increases wall-collision frequency per unit area and raises pressure.

Pressure is not caused by molecules “pushing continuously” between collisions; it is the aggregate effect of impacts.