Question

"We can easily move our hands in air but not through any solid material". Justify the statement giving any three possible reasons. ??​

Answer 1

Answer

:Solution:

(a)We can easily move our hands in air but not through any solid material because:

• The molecules in solid material are tightly packed, so movement is not possible. Air is a gas; there is lot of free space, so movement is effortless.

• The density of solid is more and air is less.

• The particles of solid cannot be displaced due to greater force of attraction between the particles.

(b) (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 2

Answer:

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Explanation:

We can easily move our hands in air but not through any solid material because:

• The molecules in solid material are tightly packed, so movement is not possible. Air is a gas; there is lot of free space, so movement is effortless.

• The density of solid is more and air is less.

• The particles of solid cannot be displaced due to greater force of attraction between the particles.

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