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).
Prove that: p=dgh
P= F/A [definition of pressure]
or, P= m*g/A [since, F= mg]
or, P= d*v*g/A [since, d= m/v or, m= d*v]
or, P= d*A*h*g/A [since, V= A*h]
Therefore, P=d*h*g