give the principle involved and specific function of autoclave and hot air oven?

Answer 1

An autoclave is a sterilizer, it kills bacteria.

The essence of an autoclave is that it kills bacteria by applying a lot of heat and a lot of pressure.

A hot air oven is just that, an oven that blows hot air.

Answer 2

Not sure exactly what you are asking but an autoclave uses superheated steam to sterilize equipment/instruments. A hot air oven would just use heat without moisture.