| |
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
|
|
Message is in Reply To:
 | | Re: Home-made One-way valve
|
| (...) 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 (...) (25 years ago, 18-Dec-01, to lugnet.robotics)
|
23 Messages in This Thread:
  
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
