01: /*
02: * JScience - Java(TM) Tools and Libraries for the Advancement of Sciences.
03: * Copyright (C) 2006 - JScience (http://jscience.org/)
04: * All rights reserved.
05: *
06: * Permission to use, copy, modify, and distribute this software is
07: * freely granted, provided that this notice is preserved.
08: */
09: package javax.measure.quantity;
10:
11: import javax.measure.unit.ProductUnit;
12: import javax.measure.unit.SI;
13: import javax.measure.unit.Unit;
14:
15: /**
16: * This interface represents the moment of a force. The system unit for this
17: * quantity is "N·m" (Newton-Meter).
18: *
19: * <p> Note: The Newton-metre ("N·m") is also a way of exressing a Joule (unit
20: * of energy). However, torque is not energy. So, to avoid confusion, we
21: * will use the units "N·m" for torque and not "J". This distinction occurs
22: * due to the scalar nature of energy and the vector nature of torque.</p>
23: *
24: * @author <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
25: * @version 1.0, January 14, 2006
26: */
27: public interface Torque extends Quantity {
28:
29: /**
30: * Holds the SI unit (Système International d'Unités) for this quantity.
31: */
32: public final static Unit<Torque> UNIT = new ProductUnit<Torque>(
33: SI.NEWTON.times(SI.METRE));
34:
35: }
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