Question

what is the meaning of negative and positive displacement

Answer 1

positive means that direction of any object along the distance...
and
negative means that direction is opposite to the distance of any object

Answer 2

A Positive Displacement Pump has an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pumps as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is a constant given each cycle of operation.

Negative displacement means distance in the negative direction. So, instead of 10 m forward from the origin, it's 10 m backward from the origin.

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