To verify the relationship between the pressure and the absolute temperature of a gas at constant level

As shown in Figure 24.1 if $p$ is the pressure of the air enclosed in the bulb and $T$ the absolute temperature of the gas, then according to the law of pressures the relationship between $p$ and $T$ of a fixed mass of a gas at constant volume is,

$$p\propto T$$

When $p$ is plotted against $T$ the graph would be as follows.

If the temperature is measured in $^{\circ}C$ the graph would be as follows:

1. As shown in Figure 24.1 place the bulb of the constant volume apparatus, the thermometer and the stirrer in the water in the beaker.
2. Heat the water in the beaker while stirring and when the temperature has risen by about $10^{\circ}C$ remove the burner and when the temperature becomes still note down the temperature reading and the pressure gauge reading.
3. Continue to heat the water in the beaker and at every rise of $10^{\circ}C$ of temperature take relevant readings six times.
4. Plot pressure $p$ against absolute temperature $T$.