Why mix salts into the ice, using to churn ice cream

ice cream
Everyone ever made ice cream will know that mix the salt into the ice will cause the lower the temperature of ice can make it up to freezing point of ice cream. If you only use ice then ice cream it can not be freeze. This is because the solubility of the salts will absorb the heat from the ice cubes out of it, thus lower the temperature of the ice cream too. The market, it uses this principleto frozen drink extremely cold or when we travel, we may use bottles to soak in water mixed with a wonderful powder. This powder is the solution have the ability to make the water be frozen but this method is quite wasteful.