Question
We know that water changes into vapour when heated. But it is a common experience that water from wet roads, rooftops and floors disappears without heating. Explain how water changes into its vapour even without heating?
✓
Answer
During the day time, sunlight falls on the water in oceans, rivers and lakes. The fields, roads, rooftops and other land areas also receive sunlight. The sunlight also carries heat with it. As a result, water from oceans, rivers, lakes and the soil, and other land areas gets continuously changed into its vapour.
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Activity.
Take a small candle and measure its length with a scale. Now, fix it at a suitable place and light it. Let it burn for some time. Now blow out the candle and measure its length again.
Can the change in the length of the candle be reversed? If we were to take some wax in a pan and heat it, can this change be reversed?
Take a small candle and measure its length with a scale. Now, fix it at a suitable place and light it. Let it burn for some time. Now blow out the candle and measure its length again.
Can the change in the length of the candle be reversed? If we were to take some wax in a pan and heat it, can this change be reversed?