MONTREAL SEPTEMBER FESTIVALS & Montreal EVENTS. Home | Accommodations | Attractions | Restaurants | Shopping & Services | Nightlife | Discover Areas | Site Map | What's New | About Us | Contact Us | Photography Credit | Advertise With Us | Terms Of Use| FranÃ§ais.
From Wikipedia, the free encyclopedia. Vapor density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapor density = mass of n molecules of gas / mass of n molecules of hydrogen. Therefore: vapour density = molar mass of gas / molar mass of H 2.
Relative humidity may be defined as the ratio of the water vapor density (mass per unit volume) to the saturation water vapor density, usually expressed in percent: Relative humidity is also approximately the ratio of the actual to the saturation vapor pressure. Actual vapor pressure is a measurement of the amount of water vapor in a volume of air and increases as the amount of water vapor increases. Air that attains its saturation vapor pressure has established an equilibrium with a flat surface of water.