One of the mysteries of the English language finally explained.
The density of a particular gas or vapor relative to that of hydrogen at the same pressure and temperature.
- ‘Being much shorter than the height of the atmosphere, the laboratory cell would necessitate a correspondingly greater vapor density.’
- ‘Even though, during the nineteenth century the science of chemistry was at a relatively early state, Dumas was able to show that the vapor densities of some organic compounds are directly proportional to their molecular weights.’
- ‘This legitimated the use of vapour densities for the determination of relative molecular weights.’
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