In the nineteenth century, European farmers realized they could quickly separate milk by using the device shown to spin the milk so that the denser milk moved to the outside and the less dense cream separated into the middle. This method of separation is best described as

Centrifuging separates materials by spinning them rapidly. The denser milk moves outward, while the less dense cream collects closer to the center. Distillation separates substances by boiling and condensing, and filtration or screening separates particles using a barrier or mesh.

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