Question

explain how some gases like CNG, PNG, LPG can be filled in cylinders

Answer 1

CNG is Compressed Natural Gas, which is mainly methane compressed at a pressure of200 to 248 bars. LPG is Liquefied Petroleum Gas, a mixture of propane and butane liquefied at 15 °C and a pressure of 1.7 - 7.5 bar. ... CNGis cheaper and cleaner, but LPG has a higher calorific value.