Two cans contained milk. In one of them, the milk turned sour, and in the other, the cream rose to the top.

Two cans contained milk. In one of them, the milk turned sour, and in the other, the cream rose to the top. In which of the cans did the physical phenomenon take place?

Milk souring is a biochemical process.

The formation of a layer of cream on the surface of milk is a physical phenomenon.

In physics, a physical phenomenon is a phenomenon in which there is no transformation of one substance into another. With physical phenomena, the state of aggregation of a substance can change (for example, water can change from a liquid to a solid state), but the composition of the substance does not change.

Among the physical phenomena, several main groups are distinguished: mechanical phenomena, electrical, magnetic, optical, thermal, atomic.