Pressure

• The effects of force acting on a surface depend on the surface area on which the force is applied.
• Pressure is defined as force per unit area, with the direction of force being perpendicular to the surface area.
• The SI unit for pressure is pascal (Pa), where 1 Pa is equal to 1 newton per square meter (N m-2).
• An elephant weighing 5,000 kg does not sink into the ground because the surface area of its sole is large, resulting in only a small amount of pressure being exerted on the ground.
• Gas pressure is produced by the collision of air molecules with the walls of its container, resulting in a force called air pressure.
• cm2 to m2 = divide the value by 10000
• Pa = N/m2
• It is easier to poor hot water if there is a hole in the cover of the kettle because air from outside enters through the hole, making the pressure inside and outside the kettle the same.