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Lesson 1 of 8
Blow Hot, Blow Cold
Points to be remembered
- We can warm our hands in winter by blowing on them when they are cold and it is quite comfortable.
- When we blow hard from our mouths onto our hands, the air from our mouths feels hotter as compared to the air around.
- If we blow onto our hands when our hands are at a distance from our mouth, it feels cool. Because before hitting our hands the air from our mouth mixes with the air around us.
- We blow over the hot foods like hot tea, hot chapatis, dal, rice, etc. to cool them. Or we can use fan to cool the foods.
- The other activities which can be done by blowing air from mouth are: whistling, playing with a firkin, for removing dust from something or for cleaning the spectacles.
- We can play different musical instruments by blowing into them, which are known as wind instruments like, flute, shehnai, mouth organ, saxophone, etc.
- If we blow hard on to a glass or mirror, it becomes hazy. Because when we blow from our mouth, which is wet itself, touches the glass or mirror and sticks on it for some time.
- We breathe in through our nose or mouth, is called inhale. The gas we absorb from the air of our surrounding is oxygen.
- The oxygen we take into our body get stored in our lungs for a short period of time.
- The air that comes out of our body through our nose is called carbon dioxide. The process is called exhale.