Investigation of relationship between pressure, volume and temperature of gas
Date of experiment: 12/11/2008
Aim of experiment:
The objective of this experiment is: 1. To study the relationship between pressure and volume of a gas at constant temperature. 2. To study the relationship between the volume and temperature of a gas at constant pressure.
When gases are compared, their volumes, temperatures and pressure are always involved. The volume of a gas is identical to the volume of the container holding it. The temperature of the gas is related to the average kinetic energy of its molecules. The gas pressure originates from the bombardments of the molecules with the container wall.
By combining Boyle’s Law, Charles’ Law and Avogadro’s Law, the General Gas Law (or ideal gas law) is proposed. It reveals the relationship between the three properties of a gas, which is pressure, volume and temperature, in a container. It states: pV = nRT where p is the pressure, V is the volume, T is the temperature of the gas at Kelvin scale, R is the molar gas constant, and n is the number of moles.
Boyle’s Law apparatus x 1
Bourdon gauge x 1
Pump x 1
Beaker (2L) x 1
Capillary tube with coloured dye thread x 1
Bunsen burner x 1
Thermometer x 1
Rubber tubing x 1
Clip x 1
Half-metre ruler x 1
Stirrer x 1
Tripod with wire gauze x 1
Retort stands and clamp x 1
Part A: Relationship between pressure and volume 1. The Boyle’s Law apparatus was set up as shown below.
2. The tap was opened initially and the pump was pressed gently to increase the pressure of the gas column and then the tap was closed immediately. 3. The volume of the trapped gas column and the reading of the Bourdon gauge were recorded. 4. By releasing the tap gradually or pressing the pump harder, the reading of the