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Science Project: How to Make Homemade Ice Cream

May 28, 2015

As warmer spring comes rolling in you might be thinking more and more about cooler sweets to eat, namely ice cream. Or maybe you think about ice cream all the time, no matter what the temperature. Regardless, ice cream is definitely one of the most delicious treats you can have, but did you know you don’t only have to buy it at the store? You can make it yourself!

Ice Cream is also a wonderful demonstration of what salt can do to ice. This is when we get science-y.  Hope you’re prepared!

Yum! Ice Cream!Yum! Ice Cream!

Water has three states: solid, liquid and gas. Water changes into its solid state when it reaches 0 degrees Celsius (32 degrees Fahrenheit), but if there is Sodium Chloride (NaCl) present, otherwise known as salt, then that temperature drops. That’s because salt lowers water’s freezing point. Have you ever noticed how when the sidewalk is icy they put salt on it to melt the ice and make it safer for walking? That’s the same principle. The salt they put on the sidewalk mixes with the ice and because it's freezing point is lower than the temperature of the unsalted ice, the sidewalk melts.

When you're making ice cream the lower temperature of the ice and salt mixture, which surrounds the cream and sugar mixture, is cold enough to change the state of the cream from a liquid to a solid, hence the name ice cream! So let's get started!

Materials

  • 1/2 cup milk
  • 1/2 cup whipping cream  or heavy cream
  • 1/4 cup white sugar
  • 1/4 teaspoon vanilla extract
  • 1/2 to 3/4 cup sodium chloride (NaCl) aka table salt or rock salt
  • 2 cups ice
  • 1-quart Ziploc bag
  • 1-gallon Ziploc bag
  • Thermometer
  • Measuring cups and spoons
  • Bowls, cups, spoons or cones to serve your ice cream treat

Gather Your IngredientsGather Your IngredientsCourtesy of Lemonythyme

Procedure

  1. Add 1/4 cup sugar, 1/2 cup milk, 1/2 cup cream, and 1/4 teaspoon vanilla to the quart Ziploc bag. Zip that bag up so nothing leaks!
  2. Put the 2 cups of ice into the gallon Ziploc bag.
  3. Use the thermometer to measure the temperature of the ice in the gallon Ziploc bag. Make sure to record this number so you can record
  4. Add 1/2 to 3/4 cup salt (sodium chloride) to the gallon Ziploc bag of ice.
  5. Place the sealed quart bag inside the gallon bag of ice and salt. Seal the gallon bag securely.
  6. Rock the gallon bag from side to side. Hold it at the seal so that the cold ice doesn’t freeze your hands instead of your ice cream. You can also use gloves or a cloth to protect your hands, just remember it will be colder than 0 degrees Celsius!
  7. Continue to rock the bag for 10-15 minutes or until the contents of the quart bag have solidified, or until you can’t wait for ice cream anymore.
  8. Open the gallon bag and use the thermometer to measure and record the temperature of the ice and salt mixture. Notice how much colder it is than the ice on its own.
  9. In bowls or cones serve and most importantly enjoy your homemade ice cream!

Ice Cream made in a bag!Ice Cream made in a bag!

Toppings

There’s always the possibility to add all different types of toppings: chocolate sauce, sprinkles, caramel, strawberries, chocolate chips! Feel free to add these ingredients to the quart bag before you mix everything, but know that your mixture will turn to ice cream much faster if you hold these special treats and add them as toppings.

What is your favorite topping?What is your favorite topping?Courtesy of Joyofkosher

Ice Cream Maker

This is a very easy way to make some delicious ice cream! If you are interested in making your own homemade ice cream all the time you may want to look into an ice cream maker. It still uses the ice and salt mixture to freeze the cream it just provides an easier and higher volume way to make ice cream at home.

Have Your Say!

What’s your favorite ice cream flavor? Share it with us in our comments section below.

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Where Was Ice Cream Invented?

  • United States.
  • France.
  • China.
  • Iceland.

General In The Forums

LUCYQWERTY123
LUCYQWERTY123 posted in Random:
"Nisya-" wrote:It would be a... super-fast-wings so I could fly anywhere and anytime :D SAME!!!! :punk 8) :D [s:p/zxl]
reply 20 minutes
irisboulevard
irisboulevard posted in Random:
Teleportation. 
reply about 2 hours
Fairkss
Explanation: Hoshi was best friends with the moon girl, Sina who secretly loved him but they drifted apart when Hoshi met Dimitre, a Russian boy. He hung out with Dimitre more and they both fell in love with each other. However, Sina was jealous and so she got Cira, the sun girl, who was in love with Dimitre to distract him and hang out with him. Dimitre was too kind to reject her so he just hung out with her. In the shadows, Sina was bullying and threatening Hoshi not to meet with Dimitre because if he did she would hurt Dimitre. One day Hoshi couldn't handle it and so he ran to find Dimitre after school. He saw Dimitre and went towards him only to get hit by a car. Dimitre saw Hoshi lying on the floor and rushed towards him and hugged him while Hoshi slowly died in his arms. Dimitre never got over his death after that point.
reply about 6 hours
Fairkss
There once was a boy named Hoshi. Just like his name his smile was as bright as the stars in the sky. One day he met another boy who's eyes were a mixture of the aqua ocean and green land, Earth. His name was Dimitre and he came from a far away land. They fell hard for each other. Their love stronger than anything in the galaxy. The star left the moon's side to join hands with the earth in their journey of love. But a girl carrying a name that meant the moon felt jealous. Jealous of the stars love for the Earth. She wanted to make it so that Hoshi could never meet Dimitre again, and with the help of another girl with her sun-kissed hair, the star could never see the Earth. The sun would blind the Earth so much that he couldn't see Hoshi who would shine brightly with teary eyes, and then when the sun would go to sleep so did the Earth, and only the stars would feel pain. Months went by and Hoshi's heart only broke harder and harder until a plan popped in his brain. The star, lost and all alone, cut off the wings that allowed him to shine and he fell out of the sky with hot fiery pain. Dimitre saw Hoshi in his hurt and painful state and embraced him. They could finally be together. Only for a brief moment, until Hoshi could feel himself slip into a deep sleep wrapped in Dimitre's arms. The star had gone out, and had left a gaping hole in the Earth's heart that could never be filled.
reply about 6 hours
nqme
nqme posted in Debating:
I appreciate it, but that doesn't help my conscience.  To me, you're practically saying "if one of us dies, that's okay because there are still plenty of other humans all around the world".  I don't put other animals above us, of course, but they still exist.  Anyway, good day.  Enjoy this egg's before  [s:p/1n9v] and after  [s:p/1n7e] because I'm not sure how to say "good day" without sounding sarcastic.
reply about 7 hours