[EVDL] Re A new way to power . . .inspires thinking

Anybody remember PLANK from an introductory Physics class?

"Also asserting that 1 HP is somehow not equal to 746 watts is like
saying that 1 inch does not "have" to equal 2.54 cm. A gallon of
water is still the same amount no matter what units you choose (or
what container you put it in.)"

Horsepower depends upon whom you are talking to:

http://en.wikipedia.org/wiki/Horsepower#SAE_gross_horsepower

Then there is the imperial gallon:

http://en.wikipedia.org/wiki/Gallon

Even the centimeter has changed over time.

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