简答题 翻译In general, gas pipelines operate at higher pressure than crude lines; gas is moved through a gas pipeline by compressors rather than by pumps; and path of natural gas to the user is more direct.

问答题翻译：the pressure of a gas varies inversely as its volume, with temperature being constant.

问答题翻译：Also similar to the pseudo-reduced pressure, the pseudo-reduced temperature of natural gases varies with the specific gravity of the gas.