Question

(a)Explain

(i)why the rate of loss of thermal the walls of the flask by conduction is very low.
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(ii)why the rate of loss of thermal energy through the walls of the flask by radiation is very low.
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(b)Suggest with reasons,what must be added to the flask shown in the pic in order to keep the liquid hot.
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Answer 1

the vacuum between the glass walls. ... Since air is a poor conductor of heat, having trapped air in the sponge and hollow plastic stopper help to prevent heat loss by conduction