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Subject :NSO    Class : Class 6

Three threads P, Q and R of equal weights were taken and immersed in water for one minute. They were then taken out and weighed again. The observations are shown in the given table.

Clothes made from which thread will be most effective when worn in winter and why?

(A) P, because it is bad conductor of heat

(B) Q, because it has lot of air spaces in between its fibres

(C) R, because it has no air spaces in between its fibres

(D) None of these.
why would any body want air spaces in their sweaters?i would think that the answer is C.please tell me the reason for which the answer is B

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