Subject:
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Re: Home-made One-way valve
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 18 Dec 2001 08:30:48 GMT
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Viewed:
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922 times
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"Steve Baker" <lego-robotics@crynwr.com> wrote:
> Jared wrote:
> >
> > you can store the vacuum in the LEGO tank or any other tank for that • matter,
>
> ...the whole concept of "storing vacuum" is a little disturbing. :-)
>
> Perhaps "lowering the air pressure" in the tank would be a little more
> reasonable!
Well said, Steve, I agree. A tank is simply a container whose inner gas (air
in this case) can have a different pressure from the one outside. This
pressure can be higher or lower than the one of the air in the environment,
but there are no conceptual differences between the two cases.
The problem in using tanks for low pressures doesn't come from the tank
itself, but rather from the Lego pump, which is much less efficient in
lowering the air pressure than in increasing it. I suspect that the reason
is because the gasket (hope this is the right term) of the piston tend to
expand under higher pressures, becoming more air-tight, while this doesn't
happen when lowering the pressure.
Mario
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Message has 1 Reply:
 | | Re: Home-made One-way valve
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| (...) Also, the external pressure is usually fairly fixed (atmospheric pressure) and there's a lower limit to the internal pressure (absolute vacuum), but no intrinsic upper limit (though it is limited by the strength of the tank). Therefore a (...) (23 years ago, 18-Dec-01, to lugnet.robotics, lugnet.technic)
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Message is in Reply To:
| | Re: Home-made One-way valve
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| (...) ...the whole concept of "storing vacuum" is a little disturbing. :-) Perhaps "lowering the air pressure" in the tank would be a little more reasonable! ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com> (...) (23 years ago, 18-Dec-01, to lugnet.robotics)
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