Pressure & Volume (PV=Constant) Lesson | GCSE Physics OCR 21st Century Higher Triple

Pressure & Volume (PV=Constant)

This lesson covers:

When kept at a constant temperature, the pressure and volume of a gas are proportional.

inversely

For a gas at a constant temperature, which statements are true?

(Select all that apply)

When volume decreases, pressure decreases

When volume increases, pressure decreases

When volume decreases, pressure increases

When volume increases, pressure increases

Which is the correct formula for the relationship between pressure and volume, at constant temperature?

volumepressure = constant

pressurevolume = constant

pressure x volume = temperature

pressure x volume = constant

For a gas at constant temperature, pressure x volume always equals the same constant. Therefore:

$p$

Where:

$p$ $1$ is the initial pressure

$V$ $1$ is the initial volume

$p$ $2$ is the pressure after a change occurs

$V$ $2$ is the volume after a change occurs

A gas occupies a volume of 0.5 m³ at a pressure of 150 Pa.

Calculate the pressure exerted by the gas if the volume is compressed to 0.2 m³?

(Assume constant temperature)

375

A gas occupies a volume of 0.3 m³ at a pressure of 50 Pa.

The pressure increased to 150 Pa, what is the new volume?

(Assume constant temperature)

0.1

m³

A gas initially occupied a volume of 10 L at an unknown pressure.

The gas was then compressed to 2 L, and measured as having a pressure of 20 kPa.

Calculate the original pressure before the gas was compressed.

(Assume constant temperature)

kPa