Air pressure is the weight of air pressing down on a unit area of surface. It varies depending on temperature, with warmer air having lower pressure than colder air because the air molecules are farther apart. Air pressure also depends on air density, which is affected by variables like temperature that impact the mass of air within a given volume.

1. Pressure
• It is the weight of air pressing on a unit area.

2. • The difference of air pressure is due to
unequal heating of the Earth.
• Warm air masses have fewer air molecules
than cold air masses.

3. What is the relation between
temperature and pressure ?
As the temperature increases the air particles
are far away from each other decreasing the
pressure
As the temperature increases the pressure
decreases

4. Air Pressure
• Air Pressure is a
measure of the force
of the air pressing
down on the earth’s
surface

5. Air Pressure can vary at any particular
point on the Earth depending on the
density of the air
Density = mass / volume