Sweet summertime science to do in the kitchen
BRYAN, Texas (KBTX) - Need something fun to do with the kids or grandkids? Why not add some fun experiments to teach a little science while making something to enjoy!
SWEET SCIENCE: Make your own ice cream
How is it Science?
When you mix the ingredients to make the ice cream mixture, they undergo a chemical change. A chemical change is what causes a substance to change into an entirely new substance. Once you put the ingredients together it forms a new substance, because they cannot be separated into their original form. As the mixture freezes into ice cream, it undergoes a physical change. A physical changes alters the appearance of a substance, but not the chemical composition.
We all know the process of ice cream melting from a frozen treat to a sticky liquid. That process is the result of a phase change. In this experiment we have the reverse phase change from a liquid into a solid.
We are able to freeze the mixture faster than usual by adding salt to the mixture. You may notice when you add salt to the ice, the water begins to melt. The water is actually not getting warmer, but it is staying at 32°F or even becoming colder because salt lowers the temperature at which water freezes. The salt lowers the freezing point of the water in a process called “freezing point depression”.
OCEAN IN A JAR
How is it science?
The ocean is made of two densities of water. The less-dense water (cooking oil) floats on top of the more-dense water (blue water). The line of separation of the two layers is called the Pycnocline. The layer on tope of the pycnocline is called the mixed layer. The mixed layer is 50- 100m deep and is affected by the heating of the sun. When the mixed layer reached 80°F, the water is warm enough to support hurricanes.
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