Q1: Write the unit of pressure?
Ans. Newton per square metre.
Q2: Do liquids also exert pressure?
Ans. Yes, liquids also exert pressure. When a liquid is put in a vessel it exerts pressure on its bottom and wall.
Q3: What is gas pressure?
Ans. The outward force per unit area of the walls is called gas pressure.
Q4: What is atmospheric pressure?
Ans. The pressure exerted by the atmospheric air is known as atmospheric pressure.