Question

What is the freezing point of milk?

(a) 0 °C

(b) -0.55 °C

(c) -1 °C

(d) -1.55 °C

The question was posed to me in homework.

This is a very interesting question from Milk Reception in chapter Collection and Reception of Milk of Dairy Engineering

Answer 1

The correct choice is (b) -0.55 °C

The explanation: Milk that has been watered down contains more water and less solutes, so its freezing point is closer to 0 °C. Most milk processors will conclude that milk has been watered down if the freezing point is anywhere above -0.55 °C.