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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.

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rainbowpoptart
rainbowpoptart posted in Random:
16. :P "Boysrock50" wrote:18 in April :( Goodness, already? That's not fair, man. You can't leave yet, you're one of the cool users. Could you maybe, like, grow younger instead of older? Because that'd be great.
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unicornsrule626
To be completely and utterly honest, i think it's slightly young. I wouldn't go any younger that 16. Being 13 myself, i think it's hard trying to decide and put a label on something like this. If you bisexual, great! Straight, great! What i'm saying is....We have PLENTY of time in life to decide, so don't rush it just to say "Hey, i'm bi!" Or "Hey, I'm straight!"
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sugarpetals
sugarpetals posted in Debating:
"RavenClawRaina" wrote: 1. closed minded people like u are the reason this whole question was asked in the first place. 2. It has nothing to do with their age or how mature they are. 3. If its what they feel on the inside, thats never going to change with a age. 4. dont use character quotes. rlly bothers me. Use ur OWN quotes or a pic or something, not a dead character from Harry Potter k?  Oh i'm so sorry if the right to have my own views has offended you, i'm just  saying that the way i see it is that at the age of thirteen a kid is now being introduced to topics such as these and their hormones are now kicking in and they should give themselves time to grow, these are my views and i'm entitled to them, just the way you are to yours. Second of all its my signature , i'll put what i want and quote what i want from who i want, and if it bothers you that much then just be the big kid you are and ignore it, K?
reply about 3 hours
RavenClawRaina
1. closed minded people like u are the reason this whole question was asked in the first place. 2. It has nothing to do with their age or how mature they are. 3. If its what they feel on the inside, thats never going to change with a age. 4. dont use character quotes. rlly bothers me. Use ur OWN quotes or a pic or something, not a dead character from Harry Potter k? 
reply about 3 hours
Princess006
Princess006 posted in Debating:
I'm 9 and I have already come out
reply about 4 hours