If the milk is mixed with air, by pumping for example, the specific gravity will be lower. 9 Fresh milk is a liquid . If you make milk cold, it will freeze at a slightly lower temperature than water. 12 Milk is slightly heavier than water. In general, milk consists of water, fat, protein, lactose, minerals, vitamins and enzymes.
Milk fat is present in milk in the form of very small globules.
The globules are dispersed in the plasma. Comparing breeds, milks with high fat content will usually contain larger globules than milks with a low fat content. The globules at the beginning of lactation are comparatively large. Towards the end of the lactation, there is a tendency for the animal to produce small globules. There are many small fat globules in milk.