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In lugnet.robotics, Mario Ferrari writes:
> "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.
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 strong tank can potentially store a much higher pressure
differential when storing high pressure than low pressure.
ROSCO
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Message is in Reply To:
 | | Re: Home-made One-way valve
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| (...) matter, (...) 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 (...) (23 years ago, 18-Dec-01, to lugnet.robotics)
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