A unit used to describe the capacity of a vacuum pump to pull a vacuum. One lusec is equivalent to a leak rate of 1 liter per second at a pressure of 1 millitorr. Such a unit has the dimensions of power, and 1 lusec is approximately 1.33322 × 10⁻⁴ watt (or newton meters per second).
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Last revised: 8 March 2008.