Evaporative cooling. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Evaporative cooling. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

As water evaporates, its surface cools. We will verify this in the following experiment. Remove from one glass of past experience black paper. Leave white paper on another glass, it will come in handy for us. Heat both glasses and wet the paper left on one glass well with hot water. Fill the glasses, as in the previous experiment, to the brim with hot water. This must be done as quickly as possible.

The glasses on the table should have the same temperature, because they are filled with water from the same kettle. After some time, measure the temperature of the water in the glasses. You will see that in a glass covered with paper, which was soaked with hot water at the beginning of the experiment, the water temperature is slightly lower. The water in this glass cools faster. Evaporation of water from the wrapper cooled not only the paper, but also the contents of the glass.

Evaporative cooling

As you continue to observe, you will suddenly find that the temperature of the water in both glasses has become equal. What happened? It turns out that the paper around the glass dried up and stopped cooling it. Then take a saucepan, pour hot water into it and, diluting it with cold water, bring it to the same temperature as the water in a paper-lined glass. Lower the glued glass into the saucepan, preventing the water from the saucepan from getting inside the glass, and, making sure that the paper is already wet, quickly remove the glass from the water and continue observing. In a glass covered with paper, the water temperature is again lower than that of a neighbor.

In this experiment, you will see how evaporation affects temperature. When it is very hot, sweat begins to stand out and its evaporation helps us to endure the extreme heat. There are clay jugs that are not glazed. Both outside and inside they have a porous surface. The water poured into them seeps through the walls of the jugs and evaporates strongly from the outside. Evaporation protects the water poured into such jugs from excessive heating by the surrounding air.

Author: Rabiza F.V.

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