Atmospheric Pressure

Important points to remember : 1. Force : Force is required to ( 1 ) move a stationary object ( 2 ) stop a moving object ( 3 ) change the velocity and speed of an object ( 4 ) change the size and shape of an object. Pressure : The force applied on unit area is called pressure. Pressure = force/area The unit of pressure is the newton per square metre ( N / m^2 ) Pressure affects substances in the solid state, liquid state, as well as the gaseous state. A fluid substance exerts equal pressure in all directions. A fluid flows from a region of higher pressure to a region of lower pressure. The pressure exerted by the atmosphere is term as atmospheric pressure. The working of a pump, a spray pump, etc., is based on atmospheric pressure.

Important points to remember : 1. Force : Force is required to ( 1 ) move a stationary object ( 2 ) stop a moving object ( 3 ) change the velocity and speed of an object ( 4 ) change the size and shape of an object. Pressure : The force applied on unit area is called pressure. Pressure = force/area The unit of pressure is the newton per square metre ( N / m^2 ) Pressure affects substances in the solid state, liquid state, as well as the gaseous state. A fluid substance exerts equal pressure in all directions. A fluid flows from a region of higher pressure to a region of lower pressure. The pressure exerted by the atmosphere is term as atmospheric pressure. The working of a pump, a spray pump, etc., is based on atmospheric pressure.