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Humidity is the proportion of vapor in the air. The air in our atmosphere contains water in a gaseous state. The humidity can change. In different areas, is different humidity. For example in the desert the air contains less water, than in the jungle. But also in one place the humidity can change. Before a thunderstorm in summer-time, the humidity is very high, but at a sunny day in winter the humidity is very low.


You can proof that our atmosphere contents water by doing our experiment: condensation.