What's colder? Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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What's colder? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Have you ever wondered why some objects that are in exactly the same conditions (and therefore have the same temperature) seem, when touched, colder than others?

To answer this question, do this experiment. Put on the table, next to it, a wooden board and a mirror. Place a room thermometer between them. After some - quite a long - time, we can assume that the temperatures of the wooden board and the mirror are equal. The thermometer shows the temperature of the air - the same as, obviously, both the blackboard and the mirror.

What's colder?

Touch the mirror with your palm. You will feel the cold glass. Immediately touch the board. It will seem much warmer. What's the matter? After all, the temperature of the air, boards and mirrors is the same. Why did glass seem colder than wood?

Your hands have a temperature of about 36,6 degrees. This is the body temperature of a healthy person. And the temperature of the glass in the room is, say, 20°. As a good conductor of heat, the glass will immediately begin to heat up from your hand, and will eagerly "pump out" heat from it. From this you feel cold in the palm of your hand. Wood is a poor conductor of heat. In our experience, it also has a temperature of 20 °, and it will also begin to "pump" heat into itself, heat up by hand, but it does this much more slowly, so you do not feel a sharp cold. Here the tree seems to be warmer than glass, although both have the same temperature.

True, the point here is not only in the different materials of the bodies. If you touch a smooth, polished board and exactly the same, but not planed, you will feel the difference in their temperatures. And all due to the fact that the number of points of contact (thermal receptors of the skin of the hands) will be different.

Author: Rabiza F.V.

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