Physics
Water will not be vapourised if

The humidity is 100%
The temperature is 100°C
The humidity is 0%
The temperature is 0°C

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

coal tar is a liquid and it flows in the barrel when it is rolled
the full weight of the barrel comes into play when it is pulled
the rolling friction is much less than the sliding friction
more surface area of the barrel is in contact with the road when it is pulled

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Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth
It rotates at the same speed as the earth around the sun
It is smaller than the earth

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