Answers

2015-12-04T20:29:22+05:30
Air frim the mouth contains co2 and water vapour the water vapour from the mouth collides the glasses becomes cool and forms droplets on the glass thus air from the mouth helps in cleaning glassea
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2015-12-04T20:37:43+05:30
Air from the mouth contains moisture.This moisture helps to clean the spectacles.
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