The pressure gauge is not given in the domestic LPG cylinders because
- AThey are so costly
- BThey cannot represent the quantity of gas in LPG cylinders
- CTheir use is not safe
- DThey are choked by LPG
Show answer and explanation
Correct answer: (b) They cannot represent the quantity of gas in LPG cylinders
Explanation
An LPG cylinder holds liquefied gas with vapour above it. As long as some liquid is left, the pressure stays at the vapour pressure of the liquid at that temperature.
So the pressure barely changes until the cylinder is almost empty, and a pressure gauge cannot show how much gas is left. The cylinder is weighed instead.