Contents
Year 410 · Water Changing State
KO

Year 4 · second unit

Water Changing State

Ice is water and steam is water. The same water sets hard when cold and flies off when hot.

A child in front of a steaming pan

I put ice in a pan and lit the flame

A board to run

Run time while you watch the thermometer. There are two odd places.

A pan of ice on the flame

I froze a bottle of water and the cap bulged

A board to adjust

Is there more water now? Freeze it while you watch the balance.

A bulging bottle of water taken out of the freezer

Drops have formed on the outside of a cold cup

A board to arrange

Where did they come from? Drag each into water going into the air, or water forming drops.

Drops on the outside of a cup of cold drink

From here temperature becomes a graph

What comes next in middle school · changes of state

Two places where the temperature stops

It is the pan you boiled above. The thermometer stopped twice. Draw that as a line and there are two flat places.

A temperature graph on dark paper, with two flat stretches

The pan from above

A board to run

This time the temperature is drawn as a graph. It is the same twenty minutes.

-20℃temperature
0 minsince the flame was lit

Back up to the basics