SS2 Second Term Physics Lesson Note – Gas Laws

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WEEK 10

TOPIC: GAS LAWS

CONTENT:

• Measurement of Gas pressure, Pressure law
• Boyle’s law and its application
• Charle’s law and its application, General gas law.

SUB-TOPIC 1: Measurement of Gas pressure, Pressure law

Measurement of Gas pressure

A manometer is used to measure Gas pressure gas pressure. One end of the tube is open to the atmosphere while the other end is connected the gas supply. When the gas is released, the gas exerts pressure on the water causing it to rise up to a height h, When the water levels are steady;

Pressure of gas = pressure of liquid at B (pressure at the level in a liquid are equal)

Pressure of gas = H + h (H = Atmospheric pressure)

GAS LAW

In an attempt to study the behaviour of gases in relation to volume, temperature and pressure, the following conditions were investigated

1. variation of volume with pressure at constant temperature, Boyle’s law (Pv = constant)
2. variation of pressure with temperature at constant volume, pressure law (P/T = K)
3. variation of volume with temperature at constant pressure, Charles law (V/T= constant)

Pressure Law or Gay- Lussac’s Law

Gay-Lussac’s law states that the pressure of a fixed mass of gas at constant volume is proportional to the absolute temperature of the gas.
P/T=Constant,

P₁/T₁  =  P₂ /T₂

Experimental verification of pressure law

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