Question

5. Why are telephone wires often given a snag?

6. Can a substance contract on heating?​

Answer 1

Answer:

Telephone wires are often given snag to allow safe contraction in winter.

Negative thermal expansion (NTE) is an unusual physicochemical process in which some materials contract upon heating, PLEASE MARK THE ANSWER AS BRAINLIEST

Answer 2

Answer:

Negative thermol Expansion is the process where substance contact on heating