This is the perfect activity for a hot summer’s day!

What do I need?

  • Milkshake
  • ice cubes
  • table salt
  • small and large
    sandwich bag
  • tea towel or gloves

Safety First!

Always ask your grown-up to help you. Your safety is your responsibility. This experiment gets very cold always protect your hands with a towel
or gloves.

How do I do it?

  1. Pour about 100ml of milkshake into the small
    sandwich bag and seal well (nobody wants salty ice cream);
  2. Put about 10-20 ice cubes in the large sandwich bag
    and add about 50g of table salt to the large
    sandwich bag
  3. Put the small sandwich bag inside the large sandwich
    bag, seal the large sandwich bag, squash the salty
    ice around your milkshake for between 5-10 minutes –
    use a tea towel as it gets painfully cold;
  4. Once you can feel that your milkshake has solidified your good to retrieve the small bag and eat your ice cream!

What’s going on?

Salt lowers the freezing point of ice and this causes the ice to melt, as the water surrounds your milkshake it is still below zero degrees celcius and causes the milkshake to freeze.

Take it further!

  • Do different milkshakes take a different amount of time freeze?
  • Try different liquids. Orange Juice? Lemonade?


If you enjoyed this activity why not check out The Academy?!