Water droplets appear when air comes in contact with a cool surface. This represents the presence of:

Water vapour in air

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Carbon dioxide in air

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Nitrogen in air

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None of the these

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Solution

The correct option is A
Water vapour in air

Water vapour in air condenses and become tiny droplets as soon it comes in contact with a cool surface.

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Similar questions

Q. The hot air we breathe out contains water vapours which turn into tiny droplets of water when it comes in contact with the colder glass of spectacles.

Q. Clouds form when water vapour in the air ______ into water droplets.

Q. A scientist performed experiments to analyse the two samples of air given to him:
'Air Sample A' and 'Air Sample B'. The results of analysis of these two air samples are given below:

Air Sample A			Air Sample B
Oxygen	:	21%	Oxygen	:	16.4%
Carbon dioxide	:	0.04%	Carbon dioxide	:	4.4%
Water vapour	:	A little	Water Vapour	:	A lot

(a) Which air sample, A or B, represents 'exhaled air'? Why?
(b) Which air sample, A or B, represents 'inhaled air'? Why?

When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of :
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour

Fuel + Oxygen (from air) $\to$ Carbon dioxide + Water vapour + Heat.
This reaction shows ___ .

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Water droplets appear when air comes in contact with a cool surface. This represents the presence of:

The correct option is A Water vapour in air Water vapour in air condenses and become tiny droplets as soon it comes in contact with a cool surface.

The correct option is A
Water vapour in air

Water vapour in air condenses and become tiny droplets as soon it comes in contact with a cool surface.