Flotation means thrust and pressure.
1.Trust:- The force acting normally (perpendicular) on a surface is called thrust. The thrust is a vector quantity and is measured in the units of force i.e., Newton (N) and kilogram force.
2. Pressure:- Pressure is defined as the thrust acting per unit area of a body mathematically we have Pressure= Thrust Area Pressure is measured in SI in Newton per square metre (Nm-2) or Pascal. And it is also measured in bar and millibars. (1bar=10sN\m2 and 1 millibar = 10m\s2).