Question

give reasons paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not

Answer 1

Hey mate here is your answer...
Because ignition temperature of paper less.

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.