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When a shaving brush is taken out of wat...

When a shaving brush is taken out of water its hair cling together, why?

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Due to surface tension the water films formed between the hairs will tend to make the surface area minimum. As a result of it, the hairs of shaving brush come closer to each other.
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Bunty was fond of painting. He observed that hairs of paint brush do not cling together when dry and even when dipped in water but form a fine tip when taken out of it. He was quite surprised to see it but found it very useful for doing neat and beautiful painting. He asked his elder sister Shanti, who was a science student of class XI, that why do hairs of a paint brush cling together when taken out of water. His elder sister explained him the reason nicely. (i) What are the values displayed by Bunty here? (ii) Why do the hairs of a paint brush cling together when taken out of water?\

PRADEEP-PROPERTIES OF BULK MATTER-Very short answer questions
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  5. Surface tension of all lubricating oils and paints is kept low. Why?

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  15. When wax is rubbed on cloth becomes water proof, why?

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  16. what is the effect of solute on the surface tension of liquid?

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  17. Water can rise up to a height of 10 cm in a capillary tube. If a capil...

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  20. How is the rise of liquid affected if top of the capillary is closed?

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