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Does water saltiness affect melt time?
Estimated time: overnight freezing of ice cubes, 1 hour for water to reach room temperature, then most of the action takes a few minutes.
No prior knowledge needed.
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Ice cube melt worksheet
mop up spilt water immediately
Watch the video, then follow the instructions.
Add food colouring to water in a jug before pouring into an ice cube tray and put the tray in a freezer overnight.
Place 2 containers of water (about 2/3rds full) and a plate on a surface indoors.
Dissolve salt in one water container (about 5 teaspoons per litre). Then wait for about an hour for it all to reach room temperature.
Take 3 equal sized ice cubes, place one in each container and one on the plate. (Optional: measure water temperature.) Start the timer.
Record the time each ice cube takes to melt.
See what happens to the melted ice by watching the food dye. If you have a thermometer, measure water temperature once cube has melted.
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SI measurement units
Challenge Topics: climate measurement, measurement science, maths
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