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Home » Science Experiments for Kids » Chemistry » How to lift an ice cube with a string

How to lift an ice cube with a string

Modified: Jan 19, 2025 · Published: Jan 30, 2023 by Emma Vanstone · This post may contain affiliate links · Leave a Comment

This science experiment using ice and salt is a fantastic demonstration of why salt is used to de-ice roads. It’s also a fun science magic trick!

When salt is spread on the road in winter, it dissolves in water on the surface and lowers the freezing point of the water. This means the outside temperature needs to be around -4oC ( the actual temperature depends on the concentration of salt in the water ) rather than 0oC for ice to form. If there’s already ice on the surface, the salt will again lower the freezing point, and the ice will melt.

In this ice and salt demonstration, an ice cube is lifted from a glass of water attached to a string! Salt is used to melt the ice, which then refreezes around the string.

two coloured star ice cubes hanging from a string. Lift an ice cube with string experiment

How to lift an ice cube with string

You’ll need

Glass or jar

Water

Ice cube tray

Food colouring – optional

Salt

String or wool/yarn

Freezer

two coloured ice cubes, string, salt and two glasses filled to almost the top with water

Instructions

Pour water ( this can be coloured with food colouring ) into an ice cube tray and place in a freezer until frozen.

Fill one or more jars with water to almost the top.

Carefully place an ice cube into each glass and top it up with water, so it is almost full.

Place a small piece of string over the top of the ice cube and sprinkle salt over where the string sits on the ice cube.

Leave for 1 minute.

Carefully lift the string from both sides; the ice cube should be attached!

an orange ice cube shaped like a star in a glass of water filled almost to the top with water. A piece or wool sits over the ice cube and salt has been sprinkled on top
a glass of blue water and an empty glass with a blue ice cube attached to a string suspended over the toppick up an ice cube with string experiment

How does this science experiment work?

The freezing point of water and melting point of ice is usually 0oC.

As soon as the ice is placed in the water, it starts to melt as the water temperature is above 0oC. Adding salt lowers the freezing point of water, making some of the ice melt. The ice melts and refreezes around the string, causing it to stick to the ice.

Instructions for a lift ice with string science experiment
Lift ice with string instructions

Extension tasks

Try sugar instead of salt

Try using sugar instead of salt; does it have the same effect? You should find adding sugar also makes the string stick to the ice. This is because, generally, impurities in water lead to freezing point depression ( a lowering of the freezing point ).

Does saltwater freeze?

Make a saltwater solution and pour it into an ice cube tray. Fill a separate compartment with water containing no salt and compare how long the two take to freeze. Depending on the concentration of the salt water, it should take longer to freeze or potentially not freeze.

More ice and salt science experiments

Make ice cream from milk using the cooling power of ice and salt. If you don’t fancy ice cream, the same technique works for making fruity slushy drinks.

Cool a drink very quickly on a hot day by placing it in a container of ice, salt and water!

Make frost appear on the outside of a tin can using ice and salt.

Find out if salty water freezes with a simple science investigation.

Find out how road gritters know when to grit the roads in this article from the Met Office.

Lift ice with string - images show a ice cube hanging from a piece of string as part of a science investigation about ice and salt

Science concepts

Melting

Freezing

Freezing point depression

Changes of state

Last Updated on January 19, 2025 by Emma Vanstone

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Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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