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).
When a body is fully or partially immersed in a liquid, name the forces acting on the body.
When a body is immersed partially or completely in a liquid, the resultant force on the body is called upthrust or buoyant force.