Which one of these things can a thermal insulator NOT do?
Keep cold things cold
Make hot things cold
Keep warm things warm
None of these
Since thermal insulator cannot transfer heat, temperature of substance kept inside a thermal isulators remains constant.
True or false?
(a) Glass is a bad conductor of heat.
(b) In a thermos flask, hot things remain hot and cold things become warm.
(c) Radiation of heat depends upon the colour of the outer surface of the body.
(d) During radiation the particles of the medium vibrate.