Information about Why is an iceberg frozen but not the water below it with Fizzics Education | Kids Science Experiments

Why is an Iceberg Frozen but not the water below?

Why is an Iceberg Frozen but not the water below?

Follow FizzicsEd 150 Science Experiments:

You will need:

Two balloons

Salt, funnel and a measuring spoon

75mL of water per balloon

A freezer

A stopwatch

1

Place a funnel into the mouth of the balloon and add at least 1 tablespoon of salt into the
balloon.

2 Why is an iceberg frozen and not water below science experiment - adding salt to the balloon

Carefully measure 75mL of water pour it into the balloon, tie the balloon and shake to dissolve the salt.

Using the funnel, add 75mL of water to the other balloon and tie it.

3 Why is an iceberg frozen and not water below science experiment - starting the stopwatch

Place both balloons in the freezer and start the timer.

4 Why is an iceberg frozen and not water below science experiment - balloons in the freezer

Check the balloons on hourly intervals.

Why Does This Happen?

Adding salt to water lowers it’s freezing point below 00 Celsius. As ice forms in polar regions, the salt within the forming ice is rejected into the surrounding water. This causes water below the ice to exist at sub zero temperatures.

Also, water expands when it freezes – try measuring the balloons diameter with vernier callipers before freezing and afterwards once it has frozen > better than exploding cans in the freezer! Expanding causes the ice to be less dense than the surrounding liquid water, thereby the ice floats.

People use salt to melt ice on roads, an important safety concern for motorists.

Learn more!

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