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Which of the following represents the lowest vacuum? (A) 10 psia (B) \( 5^{\prime \prime} \mathrm{Hg} \) VAC (C) 5 psig (D) 500 microns

Ask by Edwards Kirk. in the United States
Feb 03,2025

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Option (B) \( 5^{\prime \prime} \mathrm{Hg} \) VAC represents the lowest vacuum.

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To determine which of the given options represents the lowest vacuum, we need to understand the units and their corresponding values. - **psia (pounds per square inch absolute)**: This is a unit of pressure that represents the absolute pressure, which is the sum of the atmospheric pressure and the gauge pressure. - **\( 5^{\prime \prime} \mathrm{Hg} \) VAC (inches of mercury vacuum)**: This unit represents the pressure difference between the atmospheric pressure and the vacuum pressure. The higher the value, the lower the vacuum. - **psig (pounds per square inch gauge)**: This unit represents the pressure relative to atmospheric pressure. The higher the value, the higher the pressure. - **500 microns**: This unit represents the pressure in microns, which is a unit of length. The lower the value, the lower the pressure. Given the options: (A) 10 psia (B) \( 5^{\prime \prime} \mathrm{Hg} \) VAC (C) 5 psig (D) 500 microns The lowest vacuum is represented by the option with the highest value of pressure difference from atmospheric pressure. Therefore, the lowest vacuum is represented by option (B) \( 5^{\prime \prime} \mathrm{Hg} \) VAC.

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Beyond the Answer

To determine which option represents the lowest vacuum, it’s helpful to understand the concepts of pressure units. The lowest pressure, or highest vacuum, corresponds to the lowest absolute pressure. Among the choices provided, option (D) 500 microns of mercury (Hg) represents a low absolute pressure, as vacuum is often measured in microns. To compare them, you can convert the other units to absolute pressure. Generally, lower values in microns indicate a stronger vacuum! On a fun note, converting from pounds per square inch absolute (psia) to microns can be a bit like solving a puzzle, and each unit tells its own story about how much atmospheric pressure has been removed. Picture a vacuum cleaner sucking up all the air—just like you’d aim for getting into the deepest “clean” space with the least air in those tricky measurements!

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