1
Question
In a thermos flask, explain how are the heat losses minimised from its contents by (i) conduction, (ii) convection and (iii) radiation?
- Ans required.
- Ans required.
Open in App
Solution
The correct option is A Ans required.
In a thermos flask , heat loss is minimized from its contents by --(i) Conduction- for this a thin layer of vacuum is provided between the two walls of flask, because for conduction medium (molecules) is required , but now medium is absent.(ii) Convection- for this , the lid of flask is provided with a tight rubber stopper , so that convection currents cannot go out.(iii) Radiation- for this, the surfaces of the walls are silvered , because a shiny surface is a bad absorber and bad emitter of radiation i.e. good reflector of heat , so prevents the heat exchange between content of flask and surrounding.
In a thermos flask , heat loss is minimized from its contents by --
(i) Conduction- for this a thin layer of vacuum is provided between the two walls of flask, because for conduction medium (molecules) is required , but now medium is absent.
(ii) Convection- for this , the lid of flask is provided with a tight rubber stopper , so that convection currents cannot go out.
(iii) Radiation- for this, the surfaces of the walls are silvered , because a shiny surface is a bad absorber and bad emitter of radiation i.e. good reflector of heat , so prevents the heat exchange between content of flask and surrounding.
Suggest Corrections
1
