# AP Inter 1st Year Physics Notes Chapter 14 Kinetic Theory

Students can go through AP Inter 1st Year Physics Notes 14th Lesson Kinetic Theory will help students in revising the entire concepts quickly.

## AP Inter 1st Year Physics Notes 14th Lesson Kinetic Theory

→ A molecule moves along a straight line between two successive collisions and the average straight distance covered between two successive collisions is called the mean free path of the molecules.

→ Boyle’s Law states that, at constant temperature, the volume of a given mass of a gas is inversly proportional
to the pressure. V ∝ $$\frac{1}{p}$$ (constant temperature)

→ Charle’s laws :

1. At constant pressure, the volume of a given mass of a gas is directly proportional to the absolute temperature of the gas V ∝ T (P constant).
2. At constant volume, the pressure of a given mass of a gas is directly proportional to the absolute temperature of the gas. P ∝ T (V constant)

→ Dalton’s law of partial pressures : It states that the total pressure exerted by a mixture of non-reactive ideal gases is equal to sum of the partial pressures which each would exert, if it alone occupied the same volume at the given temperature.

→ Root mean square speed is defined as the square root of the mean of the squares of the random velocities of the individual molecules of a gas.
Vrms = $$\sqrt{\frac{3 K_B \mathrm{~T}}{\mathrm{~m}}}$$