water vapor
water vapour

On the next page, we'll look at how all that water vapor gets up so high.

There are five main ways water vapor can be added to the air.

They will also increase the average levels of water vapor in the atmosphere.

Does this mean that the water vapor will still pass through it?

"Sure, but we can use more water vapor in the air."

A small amount of water vapor is present in the atmosphere.

That's not including water vapor, of which there is a fair amount.

At higher temperatures, the data are for water vapor only.

Water vapor is a big cause of the greenhouse effect.

Water vapor is an important part of the natural greenhouse effect.