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How does heat move during convection?

Heat Convection Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises (see Ideal Gas Law).

What direction does heat transfer occur?

And unless people interfere, thermal energy — or heat — naturally flows in one direction only: from hot toward cold. Heat moves naturally by any of three means. The processes are known as conduction, convection and radiation. Sometimes more than one may occur at the same time.

Why is the back of a refrigerator painted black?

Since black is a good heat-absorbing color, it is also a good heat-radiating color. One of the things the external coils do is radiate heat, so they are painted black to help that process.

How does the texture of a surface affect the amount of electromagnetic energy absorbed?

Every surface on earth absorbs and reflects energy at varying degrees, based on its color and texture. Dark-colored objects absorb more visible radiation; light-colored objects reflect more visible radiation. Shiny or smooth objects reflect more, while dull or rough objects absorb more.

What kind of surface should an object have in order to radiate heat quickly to the surroundings?

Those materials or metals that have larger surface area are expected to radiate heat faster as compared to those materials that have low surface area. The good radiators are also expected to have high thermal conductivity. The materials or metals like copper, aluminium and brass radiate the heat better.

Which type of land surface would most probably reflect the most incoming solar radiation?


Which object reflects the greatest amount of light?

The best surfaces for reflecting light are very smooth, such as a glass mirror or polished metal, although almost all surfaces will reflect light to some degree.