This winter has been filled with so much rain and snow. I started wondering what the difference is between the salt they place on icy roads and the salt you use to make homemade ice cream?
Is it the same kind of salt? What does the salt on the road do? Does it help with friction or melt the ice?
I thought the salt mixed with ice, to make ice cream, makes the freeze temperature lower?
I’m confused…
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They both do the same thing, and since the salt you use to make homemade ice cream isn’t going into the ice cream, you could use the same salt (although most people would probably use food-grade salt in case their ice cream ends up in contact with the salt-water).
Salt drops the freezing/melting point of water/ice. This means liquid water can be colder than 0 degrees C (32 degrees F). On the roads, this is good, because ice is more slippery than water. So if it’s 28 degrees F out, you can prevent ice by putting salt down.
With homemade ice cream… when you’re making the ice cream you want your cream/sugar mixture to be well below freezing. You can’t do this with regular liquid water, and solid ice doesn’t make good contact with things. Salt-water lets you have good contact with your ice cream bowl AND be below freezing temperature.
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