In relation to a pressure of 14.3" hg, what is the reading for the second measure?

The reading of 7.64 is related to the conversion of pressure measurements, particularly when measuring vacuum pressure in inches of mercury (Hg). A pressure of 14.3 inches of mercury indicates a partial vacuum situation. To understand this in practical terms, you should know that atmospheric pressure at sea level is typically around 29.92 inches of mercury.

Therefore, to find the corresponding absolute pressure or other measurements, conversions based on gauge pressure are utilized, where the vacuum measurement must be subtracted from standard atmospheric pressure. The value of 7.64 is derived from such a conversion process, indicating the relative pressure under the given conditions.

Contextually, the other options represent values that do not align with standard conversions and calculations related to pressure readings. These may result from different calculations, units, or simply erroneous application of the vacuum principle. Recognizing how to convert the original pressure reading into a gauge or absolute pressure helps in understanding and correctly determining operational parameters in industrial refrigeration.