Fun Science Frozen Yoghurt In A Bag Experiment

Make frozen yoghurt at home without an ice cream maker! A great fun science experiment to really get kids thinking about the food they enjoy with frozen yoghurt in a bagonly 3 ingredients!

You will need:

  • Yoghurt/mousse (chocolate mousse makes a particularly delicious chocolate frozen yoghurt)
  • Large food bag x 2
  • Ice cubes
  • Salt

Method:

  • Pour the entire carton of yoghurt/multiple cartons of yoghurt into a large food bag until it is around 1/3rd full and seal.
  • Fill the other bag 1/2 full with ice cubes and 2 cups of salt.
  • Place the bag of yoghurt into the bag of ice and seal the bag of ice
  • Wrap the bag in a teatowel or wear gloves for the next bit as it’s going to get chilly!
  • Shake, squeeze and have fun with the bag – you could even play catch with it! Keep doing this for around 5 minutes until the yoghurt has turned to frozen yoghurt!
  • Grab a spoon and dig in

The Science Bit:

How what why?! Just like in the winter when we put salt on the roads, salt lowers the temperature at which water can freeze. Adding the salt to the ice means that inside the bag, temperatures can reach -5 degrees Celsius. This is cold enough to cause yoghurt inside the inner bag to freeze. The constant squishing means that the ice-cream won’t freeze in a sheet and become crystallised and turns into delicious frozen yoghurt!