I think that you would be very hard put to get a figure for the loss. This article ( http://www.scientificamerican.com/article.cfm?id=how-planets-lose-their-atmospheres ) which is referenced from the Wikipedia Atmospheric Escape article ( http://en.wikipedia.org/wiki/Atmospheric_escape ) is...
Dear Neg. Pressure,
I'm afraid that when you say that a value of 0 PSI is measured in your experiment then we can see that you are using an inaccurate device that cannot adequately measure the low pressures involved. Low pressure gauges for this experiment would be calibrated in milli or...
You're considering the problem from the incorrect direction. Pressure is always positive. Because pressure is the statistical average of all the fluid particles flying around and bashing against each other or against a surface.
For your problem starting out with a volume of 0 it means that...