Vapour density
From Fresh Dictionary
English
Noun
vapour density
- ((physics{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) The ratio of the density of a gas to the density of hydrogen at the same temperature and pressure