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Answer :
Final answer:
Values of 0 PSIA, 0 PSIG, and 29.9 inches of vacuum all express a perfect vacuum, which is an absence of all pressure. A barometric reading of 0 Hg, however, does not necessarily indicate a perfect vacuum, as it simply denotes a lack of atmospheric pressure but does not account for potential other pressures.
Explanation:
The question asks which values of pressure do not express a perfect vacuum. The values given are 0 PSIA, 0 PSIG, 29.9 inches of vacuum, and a barometric reading of 0 Hg.
Both 0 PSIA (Pounds per square inch absolute) and 0 PSIG (Pounds per square inch gauge) indicate a perfect vacuum, as these values imply that there is no pressure whatsoever. This aligns with the definition of a vacuum, which is a space entirely devoid of matter, including air, thus exhibiting zero pressure.
Similarly, a 29.9 inches of vacuum also indicates a near perfect vacuum. When measuring pressure with respect to a vacuum using inches of mercury (Hg), 29.9 inches (or 760mm, equivalent to 1 atmosphere), is a commonly accepted value representing a perfect vacuum.
However, a barometric reading of 0 Hg does not represent a perfect vacuum. Normally, a barometer measures atmospheric pressure by indicating the height to which a column of mercury rises. A reading of 0 Hg would imply the absence of any atmospheric pressure. However, even without atmospheric pressure, there could still be other pressures present, such as those from other gases. Hence, 0 Hg does not equate to a perfect vacuum.
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