My car manuals say bars for tyres. However I'm a PSI man. Bought my scuba kit in Florida. Quickly learnt to convert PSI to bars when diving in Europe.
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- posted
12 years ago
US imperialists and torque drivers
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12 years ago
Interesting.
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Gives torque in in.pounds and foot.pounds.
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12 years ago
OK I should have said metric units not SI.
Looking closer it seams to be cheap Chinese kit that's "calibrated" in kgf.cm. Pay 5 times as much and you can buy tools in newton metres or Newton cm.
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12 years ago
I thought bar supplies were measured in ounces or liters ;-) ...Jim Thompson
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I love to cook with wine. Sometimes I even put it in the food.
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- posted
12 years ago
How about "inches of water"? At least the metric ones are all powers of
10 (nearly).-- John Devereux
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12 years ago
No it isn't!
Is it?
-- John Devereux
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12 years ago
But they are still the same dimensionally aren't they?
So is there a deep reason for that?
-- John Devereux
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12 years ago
Tauno Voipio schrieb:
Hello,
kilopond was used decades ago, it is no SI unit nowadays. A "kilogram force" would depend on the local value of gravity acceleration, such dependencies are not allowed for SI units.
Bye
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- posted
12 years ago
No, they aren't. One is a torque and one is an energy. Work done is the inner product (dot product) of force times displacement. Torque is their cross product.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
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12 years ago
One is force applied, with motion, and the other is force without motion. If it moves, work gets done.
-- John Larkin, President Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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- posted
12 years ago
But is it PSIA, or PSIG?
When I started out, we had to deal with both US units, and metric. Metric was CGS. Then came MKS, followed by "rationalized" MKS, then SI.
Anyone for slugs?
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
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- posted
12 years ago
Last time I was in the UK, the tire inflaters were dual scaled PSI/Bar. Silly unit for tires, the Bar, most car tires are like one-point something.
Retrograde step anyway, Bar are CGS, 10^6 dynes per square centimeter.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
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- posted
12 years ago
I still like Gaussian units for electromagnetic calculations. None of that epsilon nought or mu nought crap.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
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- posted
12 years ago
Well yes I know that... by dimensionally I mean they have dimensions of e.g. [force][length] which is
[mass].[length][Time^-2].[length] = [M][L^2][T^-2].Yes I think that is the key, torque is a vector quantity and work is a scalar.
-- John Devereux
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12 years ago
In some countries with bail-outs, I guess :-)
-- Regards, Joerg http://www.analogconsultants.com/
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12 years ago
Who cares ... I know I need to put 32-35 pounds in the tires and it's all good.
Nah, that's only for mil and rocket guys :-)
-- Regards, Joerg http://www.analogconsultants.com/
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12 years ago
t
st
SI
ic
Ahhh no, Please! Wasn't Jackson enough? I want my capacitance to come out in Farads. How big is a 1 cm capacitor? I've got no 'feel' for cgs units. (except for Gauss :^)
George H.
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12 years ago
No thanks. I'm not French. :)
-- You can't have a sense of humor, if you have no sense.
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12 years ago
1 cm is iirc 1.12 pF, which is a nice handy size, but the Gaussian unit of inductance is seconds squared per cm, which is 9E11 henries. (That factor of c has to come in someplace.) We should call that unit the (vande)graaf, after something electrostatic that's more cool than useful. ;)
However, 20 attograafs per inch makes hookup wire sound much cooler, you have to admit. Monster Cable, are you listening?
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
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12 years ago
Make that 20 zeptograafs. Cooler still.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net