Question

15. Explain why
(a) air is used to inflate tyres
(b) steel is used to make railway lines
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Answer 1

Explanation:

) Air is Used to inflate tyres because Air is compressible and can be compressible upto some extent of pressure. (b) Steel is Used to make railway lines / path because it has the ability to expand

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Answer 2

Answer:

Air is compressed easily and steel expands when train moves on railway lines with a greater speed .