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.

问答题 翻译：No attempt will be made to derive the formula or compare it with other flow formula, as so many excellent papers have been written on this subject.