Adding and Removing Heat

Explain melting and evaporating (heat added) and condensing and freezing (heat removed), with 32 °F and 212 °F.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 25

Water changes state when heat energy is added or taken away.
Add heat to ice, and it melts into liquid water. Keep adding heat, and the water evaporates into water vapor.
Take heat away, and water vapor condenses back into liquid drops. Take away more, and the water freezes into ice.
Water freezes at 32 degrees Fahrenheit, which is 0 Celsius. It boils at 212 Fahrenheit, which is 100 Celsius.
But water doesn't need to boil to evaporate. A puddle dries up on a warm day, slowly. Heat always moves from warmer to colder things.

Georgia Standards of Excellence in Science:

S4E3.a — Plan and carry out investigations to observe the flow of energy in water as it changes states from solid (ice) to liquid (water) to gas (water vapor) and changes from gas to liquid to solid.