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Model Paper 4 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 42 Marks
Question
How will you demonstrate that air contains water vapours?
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Answer

Thoroughly dry a glass beaker and take some crushed ice in it. After sometime, droplets of water appear on the outer surface of glass. It is because of water vapours present in air, which get condensed when they come in contact with the glass surface where the temperature is very low.

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