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).
It is easier to lift the bucket of water until it remains inside the water. Why?
We know that upthrust exerted by water is always greater than air. So, the bucket of water is uplifted by greater upthrust of water in water but the upthrust of air isn't much effective. So, it is easier to lift the bucket of water until it remains inside the water.