Pumpeevne

Pumpeevne describes the ability of a device or biological system to move fluid by pumping. In engineering, it denotes how much fluid can be moved and how much resistance the pump can overcome. In a biological context, the term is used to refer to the organ's capacity to propel blood or other fluids.

In hydraulics and mechanical engineering, pumping capacity is described by the flow rate (Q), the head or pressure the pump can develop, and the overall efficiency (η). These quantities are linked by the pump's performance curve, which shows how Q decreases as head increases. The maximum flow occurs at low head, the maximum head at low or zero flow. Efficiency depends on pump design, shaft speed, fluid viscosity, temperature, and wear.

In medical terms, pumping capacity refers to the heart's ability to circulate blood. It is commonly expressed through cardiac output (volume per minute), stroke volume (volume per heartbeat), and, in some contexts, the ejection fraction, which is the percentage of blood ejected per beat. Reduced pumping capacity can indicate heart failure or other cardiovascular conditions, while preserved capacity with abnormal rhythms may occur in other diseases.

Pumpeevne is a general term that covers both technical pumps and biological pumping systems. Accurate assessment relies on context, using appropriate metrics for engineering or medical evaluation.