(a) Draw a neat diagram of thermos flask.
(b) State how heat losses by three modes of transmission are minimized in thermos flask.
a)
(b)
Heat loses in thermos flask are minimized by :
Conduction: Glass is a bad conductor of heat.
There is a vacuum between two surfaces of glass.
Convection: There is a vacuum between two surfaces of glass.
The mouth of the bottle is corked.
Radiation: The silvered surfaces are poor absorbers and poor radiators.
The mouth of the bottle is corked.