State reasons:
(i) Temperature of water remains constant during boiling.
(ii) Increase in humidity in air decreases the rate of evaporation.
Answers
Answer:
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Explanation:
(i) During boiling when further heat is supplied, the water undergoes phase transformation. Evaporation occurs i.e. water turns into vapour. The temperature is constant during the whole time.
(ii) Because there is more water, in vapour form, in the air so it is harder for even more to evaporate compared to when there is no vapour - humidity - in the air. The dryer the air is, i.e. the lower the relative humidity is, the more evaporation will occur in the air right above the water. Therefore, increase in humidity in air decreases the rate of evaporation.
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Answer:
i) Temperature of water remains constant during boiling.
When boiling occurs, the more energetic molecules change to a gas, spread out, and form bubbles. ... In addition, gas molecules leaving the liquid take away heat energy. Therefore the temperature of the liquid remains constant during boiling.
2. Increase in humidity in air decreases the rate of evaporation.
Evaporation decreases with increase in humidity and increases with decrease in humidity present in air. This means rate of evaporation is indirectly proportional to the humidity present in air. Humidity is the amount of water vapor present in air.