Heat & Temperature

Give and Take

This exhibit demonstrates that good emitters (givers) of heat are good absorbers (takers) of heat. The visitor places his/her hand near a hotplate on top of which is a piece of metal with one side painted black and the other side polished to a high shine. It is noticed that the black surface gives off more heat than the silver surface. A piece of heat sensitive liquid crystal material, on the back of which is glued a similar piece of thin silver/black metal, is placed in front of the hotplate. It is noticed that the black painted portion absorbes more heat.



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