WaterHot Water, Cold Water

Investigation 2

Part 1: Build A Thermometer

Essential Questions

• What happens when water is heated?

• What happens when water is cooled?

What You Will Learn

• You will learn how water changes when it is cooled or heated.

Part 1

Build A Thermometer

• We will use a thermometer to help us answer the questions

– What happens when water is heated?– What happens when water is cooled?

Tell Me What You Know

• What happens to water when it is heated?

• What happens to water when it is cooled?

• Talk to your partners.

• Share.

Room-Temperature Water

• The dispensing bottle is filled with green room-temperature water.

• What does room temperature mean?

Task

• Getters will get the trays with the materials they need for this investigation when I say “materials.”

• Notice that you have a glass bottle with a stopper in it that has a straw in the middle of the stopper.

• The bottle has green room-temperature water in it.

• The straw has a mark to show the level of the room-temperature water.

Task Cont’d

• Carefully turn the bottles on their side and upside down to see what happens to the water level in the straws.

• Share your observations with your partners.

Question

• What do you think will happen if we put the bottles in hot water.

• Discuss this with your partners.

• Reporters, share.

Task

• I am giving each group a cup of hot water.

• Managers, put the bottle in the cup.

• Everyone, watch the water in the bottle for 3 minutes to see what happens.

• Collectors, when I say to, mark the level of the green water on the straw.

Discuss Observations

• Talk to your partners about what you observed when the bottle was put in the hot water.

• Discuss why the water moved up in the straw.

• Reporters, share.

When Water is Heated

• When water gets warmer, it gets bigger, or takes up more space, or expands.

• There wasn’t room for the expanded water in the bottle, so it pushed up into the straw.

Question

• What else have you seen that has liquid that pushes up in a tube when it gets hot?

• What we just used is called a _________________?

• Yes, a thermometer.

Question

• What might happen if we put our thermometers in cold water?

• Discuss this with your partners.

• Reporters, share.

Task

• I am giving each group a cup of ice water.

• Managers, put the bottle in the cup.

• Everyone, watch the water in the bottle for 3 minutes to see what happens.

• Collectors, when I say to, mark the level of the green water on the straw.

Discuss Observations

• Talk to your partners about what you observed when the bottle was put in the ice water.

• Discuss why the water moved down in the straw.

• Reporters, share.

When Water Cools

• When water cools, it takes up less space, or contracts.

• The cooled water took up less space in the bottle, so it went down the straw.

Clean Up

• Collectors please return all materials to the materials station.

• Carefully take the glass bottle out of the ice water. Empty the ice water and the warm water into the sink. Replace the cups on the tray.

Essential Questions

• What happens to water when it is heated?

• It expands or gets bigger. It takes up more space.

• What happens to water when it is cooled?

• It contracts or gets smaller. It takes up less space.

What You Learned

• You learned that water changes when it is heated or cooled.

• When water is heated, it expands or gets bigger. It takes up more room.

• When water is cooled, it contracts or gets smaller. It takes up less room.

Vocabulary

• Expand – gets larger or takes up more space

• Contracts – gets smaller or takes up less room.