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Overdruk creŽren


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#1


  • Gast

Geplaatst op 08 november 2004 - 14:45

ik heb 2 vragen, allebei met betrekking op overdruk.

1) op welke manieren kan men overdruk creŽren in een ruimte?
2) en met welke meetinstrumenten kan men deze overdruk meten?

al vast bedankt

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#2

Gamer

    Gamer


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Geplaatst op 08 november 2004 - 15:51

2)

Most gauges record the difference between a fluid's pressure and local atmospheric pressure. For small pressure differences, a U-tube manometer is used. It consists of a U-shaped tube with one end connected to the container and the other open to the atmosphere. Filled with a liquid, such as water, oil, or mercury, the difference in the liquid surface levels in the two manometer legs indicates the difference between the pressure and local atmospheric pressure. For higher pressure differences, a Bourdon gauge, named after the French inventor EugŤne Bourdon, is used. This consists of a hollow metal tube with an oval cross-section, bent in the shape of a hook. One end of the tube is closed, the other open and connected to the measurement region. If pressure (above local atmospheric pressure) is applied, the oval cross-section will become more nearly circular, and at the same time the tube will straighten out slightly. The resulting motion of the closed end, proportional to the pressure, can then be measured via a pointer or needle connected to the end through a suitable linkage. Gauges used for recording rapidly fluctuating pressures commonly employ piezoelectric or electrostatic sensing elements that can provide an instantaneous response.

When a pressure gauge measures the difference between the fluid pressure and the local atmospheric pressure, the latter must be added to the gauge's indication to arrive at the true absolute pressure. A negative reading corresponds to a partial vacuum.

Low gas pressure (down to about 10-6 mm mercury absolute) can be measured by the so-called McLeod gauge: a measured volume of gas at the unknown low pressure is compressed at constant temperature to a much smaller volume, and then the pressure is measured directly with a manometer. The unknown pressure is then calculated from Boyle's law (see Gases). For still lower pressures, various gauges depending on radiation, ionization, or molecular effects are used (see Vacuum Technology).


Bron:google :wink:

#3

Mrtn

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Geplaatst op 08 november 2004 - 21:54

1) je neemt het volume gas wat er bij 1 bar in de ruimte kan en alles groter dan dat is overdruk in die ruimte. Overdruk is dan dus alles groter dan 1 m3 gas in een ruimte van 1 m3

2) met een manometer, in wat voor een vorm dan ook.. duik daar even in en dat kan je zeker vinden.
www.wikipedia.nl bijvoorbeeld
Of course, the theory of relativity only works if you're going west.
-Calvin-





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