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The cubic inch per second (symbol: in3/s) is a the unit of volumetric flow rate equal to that of a cubic inch moving each second. It is equal 1.6387064 × 10-5 m3/s.
A cubic metre per second (m3s−1, m3/s, cumecs or cubic meter per second in American English) is a derived SI unit of volumetric flow rate equal to that of a stere or cube with sides of one metre (~39.37 in) in length exchanged or moving each second. It is popularly used for water flow, especially in rivers and streams, and fractions for HVAC values measuring air flow.