Question

paper used to detect presence of moisture or water vapour​

Answer 1

Answer:

Litmus paper

It's of 2 types

1 Blue litmus

2 Red litmus

Hope it helps

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Answer 2

Answer:

COBALT CHLORIDE PAPER

Explanation:

Cobalt chloride paper is used to test for the presence of water leaking through tiny cracks in pipes or porcelain. ... As humidity increases, cobalt chloride changes color from sky blue to purple to pink. Such striking changes in color make cobalt chloride useful as a humidity indicator in weather instruments.