GCSE Physics - Pressure and Volume - How to use the "PV = Constant" Equation #30

The video tutorial explains how gas pressure is caused by particles colliding with container walls and how pressure can be increased by changing temperature, particle number, or volume. It introduces the PV equals constant equation, demonstrating that pressure and volume are inversely related. Two examples are provided: one calculates pressure when gas volume changes, and another involves compressing atmospheric air into a diving cylinder. An alternative calculation method is also discussed.

What happens to the pressure of a gas if the volume is increased while keeping the temperature constant?

• The pressure remains the same.

• The pressure increases.

• The pressure becomes zero.

• The pressure decreases.

In the example of the unknown gas, what is the constant value obtained from the initial conditions?

• 100

• 150

• 500

• 0.3

How do you calculate the pressure of a gas when its volume is reduced to 0.3 meters cubed?

• Subtract the new volume from the constant.

• Add the initial pressure to the new volume.

• Divide the constant by the new volume.

• Multiply the initial pressure by the new volume.

What is the initial pressure of atmospheric air used in the compression example?

• 101 kilopascals

• 500 kilopascals

• 150 kilopascals

• 100 kilopascals

What is the final pressure of the air in the gas cylinder after compression?

• 15,150 kilopascals

• 101 kilopascals

• 12 kilopascals

• 1800 kilopascals