Recent content by Neg. pressure

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    Vacuum Chamber: How Long Will It Maintain Pressure?

    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...
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    Calculating Force Needed to Pull Plunger in Standard Syringe

    I know this sounds counter intuitive, but those are repeated results done by different individual at different times and locations. An analogy can be made with the calculating of buoyancy of an object in a liquid. With this buoyancy calculation, you need to include the area of the sides of...
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    Calculating Force Needed to Pull Plunger in Standard Syringe

    Dear All, Thank you for your responses so far. Unfortunately, the answer has not yet surfaced. I hope that the additional information, below, will help us all consolidate of collective brain power and solve the problem.  Given; ambient pressure is at 14.7 psi (Sea level)  Given...
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    Calculating Force Needed to Pull Plunger in Standard Syringe

    I have a standard syringe 1” diameter, with a freely moving plunger requiring uniform force to move the length of the cylinder providing smooth uniform travel. Cross sectional area = ∏r2 = 3.1415 * 0.5” * 0.5” = 0.785 in2 Negative pressure acting on the piston = 0.758 in2 * 14.7 psi =...
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