Following is the container and different points are marked in it. You have to compare the pressure at those points. The container is filled with a milk of cow.
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The principle of machine milking is to extract milk from the cow by vacuum. The machines are designed to apply a constant vacuum to the end of the teat to suck the milk out and convey it to a suitable container, and to give a periodic squeeze applied externally to the whole of the teat to maintain blood circulation.
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