Have you warmed your hands in winter by blowing on them when they are cold? How does it feel?
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Why does a pendulum clock run fast on cold winter days?
The pendulum's period depends on the length of the rod, and it changes between summer and winter, as the rod expands and contracts with changes in temperature. Rods get longer in...
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A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile
(a) is a better conductor of heat than the wooden tile.
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Have you ever climbed a tree? How did you feel? Were you scared? Did you ever fall?
Yes, once I climbed a tree. It was a very exciting experience. Though I was not scared at all while climbing but once I climbed up and looked downwards for...
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You are on a mountain. How do you feel there? What can you see? What do you feel like doing there?
I feel very excited to climb up on a mountain. I can see high mountains all around. In between these are deep valleys. There are also many trees all around...
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Have you ever gone to see an old monument? Which was that? Did you feel it told you a story? What could you know about these time form it?
Yes, once I went to Agra to see Taj Mahal. I felt as if it was telling the story of its time. We could know about the culture, art, sculptures...
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Blow hard from your mouth on to your hands. How did you find the air from your mouth as compared to the air around? Was it hotter or cooler?
On blowing hard from the mouth on to the hands, the air from the mouth feels hotter as compared to the air around.
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Now put your hands at some distance from your mouth and blow again. Does the air from your mouth feel warm? Why?
When the hands are placed at some distance from the mouth and the air is blown again, this time the air from the mouth does not feel much warm. This...
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Have you seen someone blowing on their spectacles, to wipe them clean? How does the air from the mouth help in cleaning the spectacles?
The air blown from the mouth is hot and the glass of the spectacles is comparatively colder. The hot air we breathe out contains water vapours which turn into tiny...
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Put your finger under your nose. Can you feel any air when you breathe out from your nose?
Yes, I can feel the air when I breathe out from your nose
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Have you ever thought of people who do this work? Can you imagine how they would feel?
The people who have to do this work feel it very difficult, dirty, hard and laborious.
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