The hydraulic press operates on the principle of -

In automobile hydraulic brakes work on –

The pressure of a fluid varies with depth h as P = P₀ + ρgh, where ρ is the fluid density. This expression is associated with

An iron needle floats on the surface of water due to –

With the rise of temperature, the viscosity of liquid :

The immersed portion of a piece of pure ice floating in water is