# How to calculate density

In upcoming articles, we’ll be talking about the importance of “network density” as a measure of network health and effectiveness. I think network density has important ramifications for the way business works and for making the world a better place.

To better understand what it is, this article will show you how to easily calculate network density. The goal isn’t to get you calculating the network density of your Facebook connections – although you probably could if you wanted. No, the idea is to take just a few minutes to understand this easy calculation, as a way to give you a more intuitive feel for what network density is. With that, you’ll be better positioned to actually apply this important concept in your work.

## Moist Air

In the real world the air always contains some moisture. The addition of water vapour to a mass of air makes it less dense. Whilst this may appear a bit odd at first this occurs because the molecular mass of water (18) is less than the molecular mass of air (29).

The density of humid air can be calculated as the sum of the densities of the two gases, dry air and water vapour in proportion with their partial pressures.

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## Calculating Water Vapour Pressure

The amount of water vapour that a parcel of air can hold varies with temperature. The warmer the air the more moisture that it can hold. Air is said to be saturated when the temperature and dew point of the parcel are equal.

There are a number of algorithms available for calculating vapour pressure but we shall use a polynomial developed by Herman Wobus.

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The following tools allow you to calculate the density of moist air by knowing either the temperature, pressure and relative humidity OR temperature, dew point and pressure.

The density of moist air is calculated as the sum of the density of the dry air component of the mixture plus the density of the saturated component of the mixture. In the first calculator, the vapour pressure of water vapour in saturated air at the nominated temperature is calculated and multiplied by the relative humidity to give the actual water vapour pressure. The water vapour pressure is then subtracted from the total pressure to give the pressure of the dry component of the parcel. Densities of the two components are then calculated and summed to give the final answer.

If you've found our Moist Air Density calculators useful, let others know!Click To TweetBalloon Pilot and Crew Education – How to Calculate Air Density – Technical data content credited to Mr Steve Griffin