Quote:
Originally Posted by Peter Matteson
Remember vacuum is NOT pnuematics and therefore you must read the rules carefully to see what you can do each year because the wording used has changed several times in the last 3 years.
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I've never understood this line of thinking. 0 PSI (or PSIG) is ~14.7 PSIA (absolute pressure). Why does FIRST (and most FIRSTers) choose to look at pressure and vacuum differently only because it passes an arbitrary position on the scale (chosen because that force is measured at sea level)?
The gas laws all apply whether your pressure is above or below 1 Atmosphere.
It's like saying that we should treat temperature below 0 degrees as different from temperatures above 0 degrees. While it's effects on the objects around it may change (water freezing, etc) the measurement itself does not.