Answers

2015-09-14T22:12:56+05:30
Aluminium foil has smooth shiny surface. Due to which it reflects back the heat raditations emitted by the food stuffs upon them. Hence food remainr warm for longer time. Also i think in this case, reflection through its surface is very higher than conductance.



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2015-09-14T22:30:28+05:30
Foil is made up of ALUMUNIUM OR TIN OR ANY OTHER SOFT METAL THESE METALS ARE BEATEN UP INTO THIN SHEETS THE SILVER COLOUR OF THESE FOILS HELPS THE FOOD TO BE HOT FOR LONG TIME BECAUSE SILVER REACTS WITH INCIDENT HEAT ON IT 
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