In a good thermos flask, heat loss is reduced through the following features EXCEPT?
the lens surface
the insulating cork
silvered walls
the cork lid
Explanation
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MySchool u are very correctooo
. after every part of the vacuum have been sealed, the only place where heat can be lost is when u open the cork by which heat is lost by conductor and the inner cork acting as lid preventing heat lost by covection and evaporation. A is the perfect answer.
thermoflask arent sorrounded by insulators but by a vacuum bcs in an insulator theres still going to be heat loss but at a very minimal rate,but in a vacuum,theres no heat loss of any sort.
the only part of the flask with the vacuum is the cork,and its the only weak point in a thermoflask
answer remains by conduction through the cork
It is through the outercover or jacket,because the cork prevents heat loss or gain by conduction,and the silvered walls by radiation..
There are two flasks in the vacuum flask, put within each other and joined at the neck. The distance is partially evacuated from the air between the two flasks, producing a near-vacuum that greatly decreases heat transfer by conduction or convection.
