What is a Watt???
11-02-2011, 02:27 PM
RE: What is a Watt???
Just a brief note that I hope is easily understandable...
Watt = Joule per second.
I think this is the crux of the matter, in that, this is what causes the confusion.
It could easily be rewritten as
amount (Watt) = amount (Joule) over a certain time (second).
To describe a flow one needs amount AND time, so a Watt does not describe a flow, but a Joule per second does.
In short without time one merely has an amount.
Watt per square meter, W/m2, could be rewritten as
Amount (Watt) over a specified area (square meter).
This does not include time, so therefore can not describe a flow.
This is why a W/m2 is a power or pressure figure.
If one is dealing with black bodies however then a W/m2 is effectively a substitute for flow
because all the parts are "equal" black body surfaces...
So, that means all K&T and GH is explained as ALL black bodies.
They could not possibly work for gray bodies, because for gray bodies (ie the real world)
a W/m2 is merely a power figure ONLY,
the amounts of the flows are unknown...
The whole aim of practical politics is to keep the populace alarmed
(and hence clamorous to be led to safety)
by menacing it with an endless series of hobgoblins, all of them imaginary.
H. L. Mencken.
The hobgoblins have to be imaginary so that
"they" can offer their solutions, not THE solutions.
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RE: What is a Watt??? - Derek - 11-02-2011 02:27 PM
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