because salt makes the ice colder allowing the ice cream to freeze faster!
Halite or rock salt combines with ice to harden and cool the ice cream in a hand crank ice cream maker.
"The salt makes the ice melt. the melting of ice requires input of heat and this 'sucks' the heat out of the ice cream mixture causing that to freeze." You are correct. The salt lowers the freezing point of saltwater-ice mixture causing melting of the ice. Melting of ice is a process that absorbs heat due to the heat of fusion (80 cal/g of melting ice). Thermal energy is transferred from warmer (ice cream) to colder substance (ice/saltwater mixture). In this instance, heat is lost from the ice cream and transferred to the colder ice/salt-water mixture, allowing ice cream to freeze.
It depends on your ice cream maker. If you use a gel canister model, 20 minutes. Longer and your ice cream starts to melt. An ice and salt ice cream freezer can take a bit longer. Compressor ice cream makers take between 35-40 minutes. For more on the different kinds of ice cream makers and how they work, see The Ice Cream Maker (link below).
Salt water freezes at a lower temperature to regular water, so the salt helps to keep the ice from getting too cold, and turning the ice cream into just ice! it also helps stop the ice from sticking to the metal barrel.
no ther is not a ice cream maker in space
No, you sure don't! You can put the cream mixture from an ice cream recipe in a zip-lock bag and then but that in a much large bag of crushed ice, or a tupperware container of crushed ice and salt. Agitate until the recipe freezes! There are a number of creative ways to do the agitation, the ice cream maker is just more effective and efficient
Salt acts as an antifreeze, reducing the melting/freezing point of the ice. This makes the salt & ice freezing mixture much colder than that of ordinary ice, causing the ice cream to freeze faster and with smaller crystals. An ice cream with smaller crystals feels smoother and creamier in the mouth.I use a compressor ice cream maker, which requires no salt & ice mixture as it has a built in electric powered freezer.
Salt acts as an antifreeze, reducing the melting/freezing point of the ice. This makes the salt & ice freezing mixture much colder than that of ordinary ice, causing the ice cream to freeze faster and with smaller crystals. An ice cream with smaller crystals feels smoother and creamier in the mouth.I use a compressor ice cream maker, which requires no salt & ice mixture as it has a built in electric powered freezer.
Ice water is only 32 degrees F, and ice cream needs to be much colder to properly freeze. The salt lowers the freezing point of the water. The super cold water is what will actually freeze the ice cream. You can actually get the temp of the liquid water down to about 10 degrees F.
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Salt is Salt. Buy the cheapest kind you can get. If you like to make a lot of ice cream then Check out buying quantity purchase of best price products. Do not use Maldon Sea Salt.
to actually make ice cream