1. ratio of the friction for a fluid moving through an ideal pipe to the friction for a fluid moving through an actual pipe
  2. measure of how well a pump or compressor converts shaft horsepower into pressure and flow. More specifically, efficiency is the ratio of the hydraulic horsepower delivered at the discharge to the actual horsepower supplied to the shaft.

Source: IADC UBO / MPD Glossary, December 2011. Global Standards



Resources expended in relation to the accuracy and completeness with which users achieve goals.

Source: IMO MSC.1/Circ.1512, Guideline on Software Quality Assurance and Human-Centred Design for e-navigation, 8 June 2015, International Maritime Organization. Regulatory Guidance

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