Density and Temperature Experiments

Mrs. Bellatosh reviews previous experiments with thermometers and demonstrates how air and water expand when heated. She shows how a balloon expands in hot water and contracts in cold water, illustrating air expansion. Further experiments demonstrate how hot water rises and cold water sinks due to density differences. Finally, a solar tube is used to show air expansion when heated by the sun, emphasizing that hot air is less dense and rises.

What happens to the liquid in a thermometer when it is placed in cold water?

• It evaporates.

• It remains unchanged.

• It contracts and moves down the tube.

• It expands and rises up the tube.

In the balloon and bottle experiment, what causes the balloon to expand?

• Removing air from the bottle.

• Cooling the air inside the bottle.

• Heating the air inside the bottle.

• Adding more air to the bottle.

Why does hot water rise when placed in room temperature water?

• It is colder than room temperature water.

• It is less dense than room temperature water.

• It is denser than room temperature water.

• It is heavier than room temperature water.

What happens to cold water when placed in room temperature water?

• It mixes evenly.

• It evaporates.

• It floats to the top.

• It sinks to the bottom.

Which type of water is more dense, hot or cold?

• Hot water

• Neither, they are gases

• Both are equally dense

• Cold water

What should students do after observing the hot and cold water experiments?

• Write a report on the experiments.

• Draw pictures of the experiments.

• Perform the experiments again.

• Discuss the experiments with a partner.

In the solar tube experiment, what causes the bag to float?

• The air inside the bag is heated and expands.

• The air inside the bag is cooled.

• The bag is made of a special material.

• The bag is filled with helium.

What role does the color of the solar tube play in the experiment?

• It reflects sunlight.

• It absorbs heat from the sun.

• It changes the air inside.

• It makes the bag heavier.

What is the main concept demonstrated by the solar tube experiment?

• Air contracts when heated.

• Air expands and becomes less dense when heated.

• Air becomes more dense when heated.

• Air remains unchanged when heated.

What is the key takeaway from the experiments on density and temperature?

• Hot things are more dense than cold things.

• Temperature has no effect on density.

• Cold things rise and hot things sink.

• Hot things rise and cold things sink.