Vacuum Chamber: How Long Will It Maintain Pressure?

In summary, the syringe's plunger is connected to a tube in a non-vacuum state and then opened to a vacuum chamber with a pressure of 29.9 Hg. The plunger will move to its forward stop on the first run and will continue to do so on subsequent runs as long as the vacuum chamber is not emptied. The plunger will be drawn forward on its tenth run assuming minimal friction. The pressure will be affected by the added volume of air, with a ratio of added volume to total volume determining the pressure.
  • #1
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The syringe' plunger is in a fully retracted position (non-vacuum state) and is then connected to the tube forming an airtight seal. Then the valve to the vacuum chamber, having 29.9 Hg of vacuum, is opened.

I am fairly, certain that the plunger in the syringe will move to its forward most stop, on the first run. What will happen with the 2nd, 3rd, 4th, and subsequent runs, provided the vacuum chamber is not emptied after each run?

 Will the plunger be drawn forward on its tenth run?
 How will the pressure differential be affected after the first run, then the following runs?
 

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  • #2


Assuming minimal friction, the plunger will be drawn forward on its 10th run.

Assuming you allow the air to return to equilibrium temperature after each "run", you can simply ratio the volume added to the total volume to find the pressure. Ie, after 5 runs, you've added 500 cc of 1atm air for a pressure of 500/1000=.5atm.
 

1. How does a vacuum chamber maintain pressure?

A vacuum chamber maintains pressure by creating a sealed environment with a low pressure compared to the surrounding atmosphere. This creates a pressure gradient, causing gas molecules to move from areas of high pressure to low pressure, resulting in a vacuum.

2. What factors affect the duration of pressure maintenance in a vacuum chamber?

The duration of pressure maintenance in a vacuum chamber can be affected by factors such as the quality of the seal, the material of the chamber, the level of vacuum achieved, and external temperature changes.

3. How long will a vacuum chamber typically maintain pressure?

The duration of pressure maintenance in a vacuum chamber varies depending on several factors. However, with proper sealing and maintenance, a vacuum chamber can maintain pressure for several hours to days.

4. How can pressure loss in a vacuum chamber be prevented?

To prevent pressure loss in a vacuum chamber, it is important to ensure a proper seal, use high-quality materials for the chamber, and regularly monitor and maintain the vacuum level. Additionally, minimizing temperature changes and avoiding any physical damage to the chamber can help prevent pressure loss.

5. Can the pressure in a vacuum chamber be maintained indefinitely?

No, the pressure in a vacuum chamber cannot be maintained indefinitely. Over time, gas molecules may slowly leak into the chamber, causing a decrease in pressure. Additionally, temperature changes and other external factors can also impact the pressure in the chamber. Regular maintenance and monitoring are necessary to maintain a stable pressure in a vacuum chamber.

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