What is the pressure on a swimmer 10m below the surface of a lake?

What is pressure?

What is osmotic pressure?

What is radiation pressure.

The pressure just below the meniscus of water :

What is S.I. unit of pressure?

What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature? Surface tension of mercury at that temperature (20^@C) is 4.65 xx 10^-1 N m^-1 . The atmospheric pressure is 1.01 xx10^-5 Pa. Also give the excess pressure inside the drop.