Subject:
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Darn those definitions (was: The new Super Car)
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 6 Aug 1999 16:21:53 GMT
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Original-From:
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John A. deVries II <{zozzles@lanl.}stopspam{gov}>
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Viewed:
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944 times
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At 08:25 AM 08/06/1999 , you wrote:
> > Hydrolics involve a liquid, correct me if I'm wrong but that is where the
> > HYDRO comes from.
> Actually, it involves a fluid, not a liquid. Might seem like semantics, but
> by the scientific definition gases are fluids.
Wrong-o. Sorry to be flameish about this, but generally speaking
(approximately) four states of matter are accepted: solid, liquid, gas and
plasma. Liquids and gases have fairly distinct differences having to do
with the degree of inter-particle forces.
For what it is worth, however, they may have been thinking of what is
usually considered a "suspension", in other words, a dash-pot in
conjunction with a spring. Now, in this case, a dash-pot (basically a
cylinder with a hole in the piston) can use either liquids or gases because
both have a measurable viscosity which is what gives them a "linear
resistance" characteristic.
A couple of definitions:
> pneu·mat·ic
> Pronunciation: nu-'ma-tik, nyu-
> Function: adjective
> Etymology: Latin pneumaticus, from Greek pneumatikos, from pneumat-, pneuma
> air, breath, spirit, from pnein to breathe
> hy·drau·lic
> Pronunciation: hI-'dro-lik
> Function: adjective
> Etymology: Latin hydraulicus, from Greek hydraulikos, from hydraulis
> hydraulic organ, from hydr- + aulos reed instrument
---------------------------------------------------------------
John A. deVries II
zozzles@lanl.gov
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 4 Replies:
 | | Re: Darn those definitions (was: The new Super Car)
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| (...) Sorry, but air is indeed considered a fluid in fluid dynamics. The flow patterns of any fluid obeys the same general principles, whether it be air, water, oil, etc. You may very well argue that hydraulics implies not just a fluid but a liquid, (...) (25 years ago, 6-Aug-99, to lugnet.robotics)
| | | Re: Darn those definitions (was: The new Super Car)
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| to pointlessly extend the thread even more, here are actual definitions and not vague etymologies. quote: "hydraulic \Hy*drau"lic\, a. [F. hydraulique, L. hydraulicus, fr. Gr. ?, ?, a water organ; "y`dwr water + ? flute, pipe. See Hydra.] Of or (...) (25 years ago, 6-Aug-99, to lugnet.robotics)
| | | Not that you care...
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| If anyone isn't unsure, I concede that I goofed with respect to the word "fluid". I still stand staunchly by the distinction between "hydraulic" and "pneumatic". Apologies and all that to whom they are appropriate. ---...--- A small introduction: (...) (25 years ago, 6-Aug-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: The new Super Car
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| But that is false advertisement in a few senses. Hydrolics involve a liquid, correct me if I'm wrong but that is where the HYDRO comes from. Also, in the pics, they show sparkles in the hydrolics, giving a false impression. This is just like the (...) (25 years ago, 6-Aug-99, to lugnet.robotics)
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