Heating without fire. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Heating without fire. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Let us make several experiments in which heat will appear without fire and without the participation of electricity.

Let's start with heating the air. You probably have a bicycle pump at home. When you pump air into a bicycle chamber, the pump housing heats up noticeably. The piston of the pump compresses the air with force. From compression, the air heats up, and its heat is transferred to the pump housing. Mechanical energy has been converted into thermal energy.

Another experience is connected with the heating of metal. Take a piece of copper or iron wire about one millimeter thick and begin to quickly bend and unbend it. The folded area will get very hot. When you hit metal with a hammer (for example, straightening a metal bar or hammering a large nail), the place you hit with a hammer gets very hot. Here, too, mechanical energy has been converted into thermal energy.

Friction can also heat wood. Take a dry board, make a small notch in it, insert the slightly pointed end of the stick into it and begin to quickly rotate it with your palms in one direction and the other, pressing on the board. The end of the stick will get very hot from friction. In ancient times, fire was made by friction, there were no matches. Special types of wood were selected, and a small device was used to increase the speed of rotation. And in our time, in some places on Earth, tribes live who still produce fire by friction.

Heating without fire

And finally, another way to produce heat without fire is with the help of the rays of the Sun. Now in the southern regions of our country, where there are many sunny days a year, with the help of a system of mirrors, solar energy is used to heat water to the desired temperature, while saving a lot of fuel.

If you have a weak magnifying glass, on a clear, sunny day, use it to point the sun's rays at your hand. Be careful: you can feel intense heat. With a strong enough lens, you can even light a piece of paper. But this must be done carefully to prevent a fire.

Author: Rabiza F.V.

We recommend interesting experiments in physics:

▪ jet shower

▪ Egg in salt water

▪ Lenses

We recommend interesting experiments in chemistry:

▪ Experiments with ammonia

▪ Electrification by friction and drawing on glass

▪ Water is decomposed by electric current into oxygen and hydrogen

See other articles Section Entertaining experiences at home.

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