which matter would it make if enegry will be saled in MJ?? I guess no one! ----- Original Message ----- From: "James R. Frysinger" <[EMAIL PROTECTED]> To: "U.S. Metric Association" <[EMAIL PROTECTED]> Cc: "U.S. Metric Association" <[EMAIL PROTECTED]> Sent: Saturday, July 13, 2002 5:17 PM Subject: [USMA:21025] Re: Fwd: Energy unit TWH
> kilopascal wrote: > > > > 2002-07-13 > > > > The terawatt-hour is not an SI unit. There is only one SI energy unit, the > > joule. The terawatt-hour is a combination of an SI unit, the watt and the > > non-SI time unit, the hour. > > > > The watt-hour is a unit accepted with limited use along with SI, but it in > > itself is not SI. > .... > > John, > > I have to disagree with you here. The joule is a specially named derived > unit provided for energy. But other derived units, without special > names, can be and are used to express quantities of energy, such as the > newton meter, the watt second, the pascal cubic meter, and so on. > > Marvelously, due to the coherence of the system, the numerical factor > that relates each item in that short list above to the joule is "1". > Since the hour is accepted for use with the SI, the watt hour can be > used to represent quantities of energy, but since the hour is not a > coherent unit within the SI, the conversion factor is > 1 W.h = 3.6 kJ > with the period on the line in W.h representing the raised dot for > multiplication. > > Jim > > -- > Metric Methods(SM) "Don't be late to metricate!" > James R. Frysinger, LCAMS http://www.metricmethods.com/ > 10 Captiva Row e-mail: [EMAIL PROTECTED] > Charleston, SC 29407 phone: 843.225.6789 >
