Density Review

Front

What is density?

Back

Density is the mass of an object divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

How does density affect whether an object floats or sinks?

Back

An object will float if it is less dense than the fluid it is in; it will sink if it is more dense.

Front

What is the formula for calculating density?

Back

Density = Mass / Volume.

Front

Why do helium balloons rise in air?

Back

Helium balloons rise because helium is less dense than air.

Front

What happens to the density of water when it freezes?

Back

When water freezes, it becomes less dense, which is why ice floats on liquid water.

Front

What is the relationship between compactness and density?

Back

More compact objects generally have higher density because they have more mass in a given volume.

Front

If two objects have the same volume, how can you determine which is denser?

Back

You can determine which is denser by comparing their masses; the object with the greater mass is denser.

Front

What is an example of a substance that is less dense than water?

Back

Oil is an example of a substance that is less dense than water and will float on its surface.

Front

What is an example of a substance that is more dense than water?

Back

A rock is an example of a substance that is more dense than water and will sink.

Front

How does temperature affect the density of gases?

Back

As temperature increases, the density of gases generally decreases because the gas expands.