Wrapping a hot dish of food in shiny aluminium foil seems to keep the dish warm longer than wrapping it in clear plastic film. aluminium is a much better conductor of heat than plastic , so why does it impede the flow of heat so well ?

1

Jawapan

2016-07-14T22:18:18+08:00
It reflects radiant heat back into the dish. Aluminium foil is sometimes used to do this behind central heating radiators and also in underfloor insulation.