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Explore physical science.

The States of Water unit.

Did you know that water covers 75% of Earth's surface? Scientists estimate that there are 326 million trillion gallons of water on Earth.


We read that number as 326 quintillion.

There is also water in the air. On an average day, there are approximately 3,000 cubic miles of water in the atmosphere. The amount of water in just one cubic mile is equal to the number 10 followed by twelve zeroes - 10,000,000,000,000!

Multiply that number by 3,000 and you get 30,000,000,000,000,000 (30 quadrillion)! That's about how much water is in the air. Thirsty yet?

  • liquid state
  • solid state
  • gas state

What state am I in?

All of the water on Earth exists in one of 3 states, or forms.

Those states are solid, liquid, and gas.


Liquid water gathers in oceans, rivers, lakes, ponds, puddles, sinks, and bath tubs.

Liquid water takes on the shape of whatever container it is put into, whether it's a stream or a drinking glass.


Water in its solid form is ice, frost, or snow. One form of precipitation, hail, also falls from the sky as a solid.


Water can also take the form of a gas.

In this state, it is called water vapor or steam.

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