简答题 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.

问答题翻译：Using this result fig. 1 is entered on the bottom line vertically to the intersection of the chart line and the conversion factors are read in the left hand column.