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dont have any. So, were going to make ice cream using
science! We know that ice cream is made out of cream
and sugar and a flavor. And we know that its frozen, but its
not rock hard like plain ice. Its more like very cold whipped cream! So, we have cream and sugar.
We also have vanilla that well flavor our
ice cream with. And now were going to take these three
ingredients and turn them into ice cream! And you can do this at home, too. Youll need your three ingredients: sugar,
vanilla, and cream. Or you can use milk or half and half instead
of cream.
Youll also need a measuring cup, measuring
spoons, oven mitts or a towel, a small sealable plastic bag, a large sealable plastic bag,
ice cubes, a timer, and a grownup to help. The last thing youll need is the important
one: salt! First, take your three ingredients and put
them into the smaller bag. Were using a half cup of cream, a half
teaspoon of vanilla, and a tablespoon of sugar. And then, seal up that bag.
Next, put ice into the big bag. Were putting four cups of ice in. Thatll make the cream cold. But, heres the amazing scientific part! Were going to add salt to the ice.
Were adding half a cup of salt. Its important to add salt to the ice, because
that will make the ice cream freeze much faster. Heres why: If youve ever put out salt on your sidewalk
or driveway in the winter, you know that salt can melt snow. Thats because when theres lots of salt
in water, it needs to be colder than plain water does to freeze.
Even if its cold enough outside for /plain/
water to freeze into snow, its probably not cold enough for /salty/ water to freeze! So when you add salt, the salty snow melts. When you add salt to the bag of ice, the same
thing happens. The ice is cold enough to freeze when its
just plain water. But its not cold enough to freeze when
theres lots of salt! So the ice cubes in the bag start to melt! That melting is /really/ important for making
your ice cream really cold, really fast.
Because as the ice melts, it draws in heat,
making the things around it much colder including your ice cream! So, now that weve added salt to our bag
of ice cubes, the ice is going to start to melt and make the cream, sugar, and vanilla
in the smaller bag REALLY cold. While thats happening, were going to
make sure the ingredients in the bag become ice cream! This is where we need our oven mitts or a
towel because this bag is really cold. Protect your hands and hold onto the bag. Now were going to shake it! Its good to have a friend to help you with
this part.
Squeaks and I have made butter before, and
we shook up the cream until it got hard and turned into butter. But before it turned into butter, it was soft
and fluffy whipped cream. Ice cream is harder than whipped cream, but
softer than butter, so well have to shake our cream /longer/ than we would to make whipped
cream, but /not/ as long as we would to make butter. There are tiny pieces of fat in the cream,
and as we shake the bag, theyll start to clump together until the mixture becomes thick
and creamy, just like ice cream should be.
If our salt water solution is as cold as if
feels, that should take about five to ten minutes. Ready, Squeaks? Its getting there! It looks like whipped cream now. Just a little bit longer. Its looking a lot more like ice cream to
me.
Lets open it and check. Make sure you have a spoon handy to taste
test! What do you think, Squeaks? Tastes good to me! We did it! And we hope your science ice cream is delicious
too! Make sure to ask a grown up help you with
your experiments and share your results! Squeaks and I want to thank our friends at
Google Making Science who helped us with this experiment. Let us know how your ice cream turns out by
emailing us at kids@scishow.Com Thanks and well see you next time here
at the Fort!.
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