heat

Heat:Heat is a form of energy that can move from the hotter object to the colder one. The temperature of the cooler object rises while that of the hotter one falls until both are at the same temperature.Three methods of heat transfer are:
1) Conduction2) Convection3) Radiation

Heat is a form of energy. Light is also a form of energy. Scientist mentioned that energy can only travel through medium, but not vacuum. Then how did the sun's energy reach us?Well, it is through radiation. Actually, this is quite a good news, isn't it? I say that because, if we were to imagine if the outer space were not vacuum, and were to be filled with all sorts of medium, then heat and light energy would be able to travel through space and reach earth really quickly. And because of that, water on the earth would evaporate even faster and we human beings and all sorts of living things on earth would dehydrate at a high rate. In the end, we would all die of dehydration. Yes, so, having a vacuum in space is not such a bad idea.

The movements of the hot and cold air moves through convection. Convection currents are set up which transfer heat from the hotter region to the colder regions.What is radiation then?Radiation is the transfer of energy through vacuum in the form of waves.

Note:All hot objects gives out energy as radiation. The radiation moves in all direction.Radiation itself is not hot, but when absorbed. is change when heated.All objects are able to absorb radiation.