Answers

2014-11-25T17:33:25+05:30
because  it can't take place from below the liquid and also open liquid gets exposed to environment 

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2014-11-25T17:42:14+05:30
because it depends on the width of the surface 
if the surface is more evaporation rate will be more and when the surface area is small evaporation rate will be sloww
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