The silvering in thermos flasks is done to avoid heat transfer by:
Convection
Conduction
Radiation
Both convection and conduction
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2015
– The vacuum between the double walls reduces heat transfer by conduction and convection.
– The stopper reduces convection (and some conduction).
– The silvered surfaces (typically vacuum-deposited aluminum) on the inner and outer walls are poor emitters and excellent reflectors of thermal radiation. This significantly reduces heat transfer by radiation across the vacuum.