Let's create some home made yoghurt.
There is a simpler way to frame this question — how is yoghurt ‘frozen’? In this article, we are not going to dive into the technical know-how, but share simple science! We can create our own batch of frozen yoghurt, and watch the yoghurt changes into a more solid form. All you need to do is fill a small ziplock with yoghurt, and another big ziplock with ice cubes and salt. To ensure that the salt does not fall out of any holes in the pouch. Do not forget to seal the ziplock.
Before we proceed, here’s what you should ask. Why do we put salt on the ice cubes? The salt on the ice cubes allows the ice to melt. The ice takes in heat that is present around, but salt is the catalyst that spurs the process. Have you ever wondered why salt is sprinkled on ice when it blocks roads during a storm? So that, the ice melts!
Now, let's move on. This is when we place the ziplock of yoghurt inside the ziplock of ice cubes, the ice takes in the heat from the yoghurt, making the yoghurt colder. Isn’t that interesting?
Whether you use a ziplock or a bowl on top of a larger bowl, the process remains the same. If you want to make a batch of fresh frozen yoghurt at home, do consider explaining to your siblings how you were able to whip up your own frozen yoghurt without any fancy equipment.
You may also want to make a bigger batch of frozen yoghurt, but that would entail using up more ice, yoghurt and of course, bowls or zip locks.
We hope that we were able to simplify the answer to this question, which is so often asked. Though making frozen yoghurt may involve a technical process and involve a lot of methods and rules, we cleared some doubts by doing the activity, isn't it? We hope that you'll turn more such questions into a fun and educational activity.