Eternal barometer. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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Eternal barometer. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

You have, of course, friends in the camp or at the dacha. If you decide to go hiking with your friends, you will be interested in what the weather will be like. To determine it, you can make a "perpetual barometer". To make it, take a 10% solution of cobalt nitrate or another solution: cobalt chloride (1 weight part), gelatin (10 weight parts) and soda (10 weight parts).

Saturate a thin white cloth with one of these solutions and, when it dries, stick it on cardboard. Dry tissue will have a blue color, it will turn pink in moist air, and the more humidity, the stronger. Watching the change in the color of the fabric, one can judge the approach of rain.

Author: Shkurko D.I.

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