The volume of a gas varies according to the conditions. If the gas is heated, the gas particles move faster, which increases the volume of the gas. The relationship between volume and temperature will be investigated.
To measure the volume of a fixed mass (amount) of gas at different temperatures.
The results can be displayed in a table like the one below:
|Temperature of ‘room temperature’ water in bowl in stage 1 (°C)||Reading on measuring cylinder at the start (cm³)||Temperature of water in bowl in stage 2 (°C)||Reading on measuring cylinder at the end (cm³)||Volume of gas collected (cm³)|
Compare how the volume changes at each temperature. Explain the answer in terms of the movement of the molecules.
Measurements of volume of gas collected are subject to experimental error, which could be because:
|Hot water can scald.||Splashing or spilling hot water on skin can cause a scald.||Use heater baths if available for investigating.|
|Broken glass is sharp.||Overtightening the clamp on the glass measuring cylinder may break the cylinder giving a danger of cuts.||Take care not to overtighten the clamp. Use plastic as an alternative to glass.|