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LV超3A名牌購物網

1.為何衣服可以保暖?
A layer of still air is trapped between the clothes and your body. Because air is a poor thermal conductor, this prevents heat lost from your body.  

2.為何冷氣機安裝在牆壁高處?
Cool air coming out from the air-conditioner, because of its higher density, sinks to the floor. This sets up a convection current until all air inside the room is colled down.

3.為何黑色燒瓶盛載的水散熱較快?
Black surface dissiaptes heat by radiation much faster than shiny surface. Hence, the black surface helps to dissipate away heat from the water more quickly.

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