What is atmospheric pressure?
Air has mass which has pressing effect on the Earth.
How do you measure atmospheric pressure?
A Barometer.
Define the law of Boyle?
Boyle’s law states that if the temperature of a gas is constant, the volume of a gas is inversely proportional to its pressure.
Define Charles’ law?
Charles’ law states that the volume of a gas is directly proportional to its absolute temperature if the pressure is kept constant