Define pressure. Give its SI unit.
The total force applied per unit area is called pressure.
Mathematically,
Pressure (P) = Force (F) / Area (A)
Its SI unit is pascal (Pa).
State Pascal's law. Name any two instruments based on Pascal's law.
Pascal's law states that "when pressure is applied on a liquid enclosed in a vessel, it is transmitted equally in all directions." The two instruments based on Pascal's law are: