Bath, Pa,

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**Water In The Atmosphere** II of II

The atmosphere is made up of about:

**78 % Nitrogen...About 21 % Oxygen...& About 1 % of all other gases, such as Ozone...Neon...Carbon Dioxide...to name a few**

Whenever water vapor is added to the atmosphere, it will displace the other gases in equal volumes.

If all the water vapor were to condense out of the atmosphere at one time, we would have about an inch of added water over the earth, with about 11/2 inches over the equator and about 1/2 inch over the poles.

**Water vapor is less at the poles and most at the equator**

The small amount of water vapor (about 4 percent). in the atmosphere, contributes to our changing weather. Add water vapor to the atmosphere and the pressure lowers. Substract water vapor, pressure rises.

We can see the rise and fall of this pressure with a weather instrument called a:

**Barometer**

Moist air is lighter than dry air. On a weather map we call these:

**High & Low Pressure Areas**

The chemical compound of water:

**H2O. H, Hydrogen...O, Oxygen**

Water consists of 2 parts hydrogen and 1 part water. Water is transparent, and in its purest state is:

**Colorless...Odorless...& Tasteless**

The earth consists of about 71 percent water.

Water droplets are so small you could put more than:

**100 million in a teaspoon**

At the center of each water droplet is even a smaller speck of:

**Dust...Salt...Smoke**

These form the nuclei for the water droplet.