Crystallization of milk
Step 1: We pour the milk into the zip lock, close it and put it in the container.
Step 2: Put the ice on its zip lock, and then pour the salt on the zip lock.
Step 3: Shake the test tube rack by push and pull it.
Step 4: After shake it, the milk will be freeze and you can eat it! In addition, you can add some topping if you like it.
Result: It is very delicious!
1) why do we add salt to the ice?
Answer: It destroys water's bond so the temperature drops down faster.
2) why do we add the cookies and other things, only after the milk has frozen slightly
Answer: Because some topping is heat capacity so it will slow down the process.
3) what are two factors that affect the freezing you think?
Answer: Movement and temperature.
4) why do you need a bit of air in the bag?
Answer: For the milk to move around to make contact with the ice.