Hi, Milkfans
The freezing point of milk is used to detect added water. As you should know water freezes at 0° C and because milk has some salts and lactose that are in solution the freezing point of milk is slightly lower than water - to the point of about a half a degree Celsius.
In fact for the test, the freezing point of milk should fall between -0.512° C and -0.550° C. If it is closer to zero water is added and if it lies beyond -0.550° C the milk is either going sour or solids, like whey powder was added.
Kind regards,
Leon the Milkman
Milkman
What this means is that milk with water added will freeze faster than normal milk.
