Question

give reason paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipes does not ​

Answer 1

This is because paper has a low ignition temperature hence it catches fire easily whereas a piece paper wrapped around a aluminium pipe has higher ignition temperature because the aluminium pipe absorbs the heat when the temperature rises and hence ignition temperature is increased.

Answer 2

Answer:

As its ignition temperature is low, the paper by itself catches fire easily. But a piece of paper wrapped around an aluminium pipe does not catch fire easily, as the heat being given gets absorbed by the aluminium pipe and the piece of paper does not get its ignition temperature.