Answers 1. The Force exerted on a surface per unit area is called pressure Pressure = Force /Area Pressure is inversely proportional to the area on which it is applied That is, when the area is increased the pressure exerted by applying a force is less. 2. As the depth of the sea increases, the pressure increases since pressure increases with depth. The pressure exerted by water deep under the sea is much greater than at the sea level. Hence, the deep sea divers wear special suits which protect them from extreme pressure of water. These suits are called diving suits. These suits contain buoyancy compensators to combat the weight of their diving equipment and the pressure of water at great depths. 3. Pressure exerted by a liquid : Liquids exert pressure on the walls of the container . Pressure exerted by the liquid at the bottom of the container depends on the height of its column. ... Pressure exerted by a gas : Gases too exert pressure on the wal ls of the container 4. Force applied is 100 N. Surface Area is 4 m2. The pressure can be expressed as Pressure = Force / Area Substitute all the values, Pressure = (100 N) / (4 m2) Pressure =25pa. 5. It is easy to walk on sand with flat shoes and not high heels because the surface area of heels is less than that of flat footwear. Surface area is inversely proportional to pressure. So, we feel less pressure while walking with flat shoes of gr eater surface area.