Physics: BEHAVIOUR OF GASES NOTES(masterclass)

, BEHAVIOUR OF GASES

POSTULATES OF KINETIC THEORY OF
GASES
1. All gases are made up of very tiny particles
called molecules.
2. Gas molecules are in constant, random
motion in all directions.
3. Due to this motion, molecules collide with each
other and with the walls of the container.
4. The collisions between gas molecules are
perfectly elastic (no loss of energy).
5. When gas molecules strike the walls of the
container, they exert force. The force per unit area
is called gas pressure.
6. Gas molecules do not attract or repel each
other.
7. The volume of gas molecules is negligible
compared to the total volume of the gas.
8. The average kinetic energy of gas molecules is
directly proportional to the absolute
temperature.

, BOYLE'S LAW
Boyle's law state that for a mass at constant
temperature, volume of the gas is inversely
proportional to its pressure.
Vk 1/p when mass and Temperature are constant
or, V= K 1/p
or, PV=K
or, pV=Constant=K
or, p₁V1=P2V2=P3V3


CHARLES' LAW

For a given mass of a gas at constant pressure,
volume increases or decreases by a constant
fraction of 1/273 of its volume at 0°c for each
degree rise and fall of temperature


DERIVATION

Let the volume of the gas at 0°C be V₀.0
At 1°C: