Name: An Activity to Demonstrate Convection
Uploaded: 2019-07-19
Duration: 2 min 29 s
Description: Convection currents can have some fun effects. Here, we conduct an experiment demonstrating one of the effects of a convection current. Watch and learn.

Question

Under what conditions does heat flow from a hot body to a cold body by conduction?

Accepted Answer

Matter (which may be solid, liquid or gas) is made up of tiny particles called molecules. These molecules are never still; they are in constant motion. Molecules in a solid are tightly packed and are unable to move around freely. However, they vibrate around a fixed point. Let us take the example of a solid rod being heated at one end by a candle flame.

Heat causes the particles to vibrate faster at the end of the rod in contact with the flame. These particles bump with each other and transfer energy to neighbouring slow-moving particles, which are further away from the flame. The neighbouring particles start vibrating faster and, in turn, pass on energy to their neighbours on the other side. In this way, heat energy gets transferred from one particle to the other. It should be noted that each vibrating particle remains in its original position. This form of heat transfer by actual physical contact is called conduction. It occurs by collisions of neighbouring particles of the body.

Under what conditions does heat flow from a hot body to a cold body by conduction?

Important Questions on Temperature and Heat

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