Answers

2016-05-07T13:39:09+05:30
Leave an iron object in open for a month and we will get that iron is rusted which show that vapor if present in air rusting of iron occurs in presence of oxygen and water vapours
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2016-05-07T14:18:14+05:30
To demonstrate whether water vapours are present in air or not, just practice this experiment out. Take out a chilled water bottle from the refrigerator and fill a steel glass. After filling the glass you'll notice that some water droplets appears outside the glass. This only shows that water vapour is present in air.
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