Homemade ice cream in a plastic bag, on a hot summer day there is nothing better than ice to cool you down. But what happens when you find the freezer of frozen delicacies empty? Do you have no luck? Not necessary If you only have a few simple ingredients and kitchen accessories, you can make your own ice cream. There is no ice maker, you say? Armed with its ingredients and some basic knowledge of science, you will find that you can enjoy a sweet and creamy gift within minutes.
1. Mix half a cup, 2 tablespoons of sugar and 1/2 teaspoon of vanilla extract in each bowl. Pour the contents of each bowl into a plastic bag with a small cap. Squeeze the air and close the bag firmly.
2. Label a plastic bag with aliter cap, "ice with salt" and the other, "ice without salt". Add about 4 cups of ice each time.
3. Put 1 cup of rock salt in the bag labeled "Ice with Salt" and shake the bag to mix the ice with the salt. Do not add salt to the other bag.
4. Now place a bag with half and half of the mixture in the pack ice and the other in the pack ice with salt. Close the bags with force.
5. Wear gloves or gloves to prevent your hands from getting cold.
6. Shake and press each ice bag for 8-10 minutes. You may want multiple people to help you with this process. What do you think will happen in every bag?
7. Watch from time to time the smaller bags during the shaking process. What happens to half and half of the mixture in the pack ice with salt? What about the other bag?
8. Remove the small bags from the larger ones when the time runs out. What did you notice? Is every half and half pack frozen in ice?
9. For a deeper exploration, try this project again with different dairy products such as cream or 2%, compare different amounts of salt or try different types of salt.
Use multiple people to help with the movement and pressure of the bag, so that your arms do not get too tired. If your mixture does not appear to be frozen, shake and squeeze another five minutes.
Why were half and half of the mix frozen or not frozen? What role does salt play and why was it added to ice cream? Why do you constantly have to shake and push the bag? Without obligations, cancel at any time.
In this experiment, we tried to make homemade ice cream using a freeze process that did not use a freezer or an ice cream maker. If we use an ice pack and a bag of ice with salt, we try to freeze a mixture of half and half, sugar and vanilla. In the end, we have two different products, and only one was ice cream.
Why did the mixture froze in the salt ice while the other did not? To answer this, we need to take a closer look at the mixture of ice and salt. Ice is just frozen water at 32 degrees Fahrenheit (0 degrees Celsius), right? When we put salt in the ice, something interesting happens.
The salt creates a reaction that melts the ice. Have you ever been on a sidewalk on a cold winter's day and have seen rock salt on the ground? It is used to melt the ice so that people do not slip or fall. You may wonder why we want to melt the ice if we try to freeze the mix. It will be interesting here.
Because the salt melts the ice in the water, it actually lowers the freezing temperature of this water. That's right, the temperature of the salty ice cream mix in the bag will drop below the original temperature of 32 degrees Fahrenheit. This provides a cooler environment than simple ice and must freeze the mixture successfully.
One last question: why not put the mixture in the freezer for a few hours? This would give him a milky palette that is as hard as a stone and not creamy. Puffing and squeezing stir the mixture and add air to the creamy texture.