Question

4. Why does a cooking gas cylinder feel lighter after it has been in use for a few days?
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Answer 1

Answer:

Cooking gas cylinders contain LPG (liquefied petroleum gas). Thus, liquid evaporates and goes out of the cylinder gradually, as we use and finally, gets empty.... This makes it light when the cylinder becomes empty.

Hope this helps you

Answer 2

because the compressed hydro carbons I mean lpg may finished