You have a glass of milk and a glass of water you need to pour them into the same container such that the two liquids are differentiated and can be separated how do you do it?

Pour the water first, freeze it, and then pour the milk. The freezing point of raw unprocessed milk is ∼−0.5 degrees Celsius, so by keeping the barrel under 0 degrees, but above −0.5 degrees, you can keep the water frozen and the milk liquid, and be able to separate them.

You can freeze the whole thing below −0.5 degrees. Just don’t warm it suddenly above 0 degrees without separating the milk first.

In fact, the freezing point of milk can be and is used as a test to check whether water was added to milk by producers.

d. the weight of the book