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CBSE Class 11-science Answered

q1.a few 100 years ago ,fruits and vegetables were being stored in underground cellars ,discuss the advantages of choosing this location as a storage site!! Q2.why is a person able to remove dry aluminium foil from a hot oven with bare fingers but burns his/her fingers if there is moisture on the foil??
Asked by Vishakha Rathod | 12 Feb, 2014, 05:19: PM
answered-by-expert Expert Answer

Ans 2.

Aluminium has a low thermal capacity so it retains less amount of energy. If     a person touches the foil with bare hands, his fingers do not burn.

Moisture means presence of water which has high specific heat capacity,       that means it retains more amount of heat. So if a person touches the foil       which has moisture, his fingers will burn.

Ans 1. Ask the other question as a separate query.

Answered by | 12 Feb, 2014, 06:52: PM
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