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Blowing Out

If I hold my hand in front of my open mouth and blow, the air feels warm but if I blow through pursed lips the air is cooler. Why?

Air coming out of the open mouth is more or less at the temperature of the inside of the body, so it is warm.
When air is blown in a thin stream through the lips, it feels cooler because whenever a gas expands, it cools. When the air is forced through pursed lips, it is compressed slightly and when it is released from the mouth it expands and cools.
Another reason for its coldness is that the fast-moving stream of air draws in cold air from the surroundings.

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Dimdima is the Sanskrit word for ‘drumbeat’. In olden days, victory in battle was heralded by the beat of drums or any important news to be conveyed to the people used to be accompanied with drumbeats.

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Bharatiya Vidya Bhavan
K. M Munshi Marg,
Chowpatty, Mumbai - 400 007
email : editor@dimdima.com

Dimdima Magazine

Bharatiya Vidya Bhavan
505, Sane Guruji Marg,
Tardeo, Mumbai - 400 034
email : promo@dimdima.com

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Dimdima.com, the Children's Website of Bharatiya Vidya Bhavan launched in 2000 and came out with a Printed version of Dimdima Magazine in 2004. At present the Printed Version have more than 35,000 subscribers from India and Abroad.

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