The
amount of moisture in the air, i.e. humidity, can be used as the basis for
forecasting the weather. When the humidity is high, rain is likely, while a low
humidity usually indicates a dry spell. This project is based on the colour
change produced in cobalt chloride by the moisture in air.
- Take a small sheet of blotting paper and cut it in the shape of a flower.
- With the help of cotton thread and a sewing needle, tie it with the thin wooden stick.
- Now take about 20 gm of cobalt chloride from a chemicals supplier or from your laboratory and make a strong solution of it in water.
- Dip the blotting paper flower in this solution, then put the flower in a warm place to dry.
- Now, your weather-indicating flower is ready for use. If the colour of the flower becomes pink on some day, it indicates a storm; if the colour becomes bluish-pink, it indicates rain; and if the colour becomes light blue, it indicates dry weather.
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