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Answer :
A deep vacuum is usually measured in microns. Here's a detailed explanation:
### Measurement Units Explained:
1. Psig (Pounds per Square Inch Gauge):
- Psig measures pressure relative to the surrounding atmospheric pressure. It’s used for pressures higher than atmospheric pressure, not for vacuums.
2. Psia (Pounds per Square Inch Absolute):
- Psia measures absolute pressure, which includes atmospheric pressure. It’s the absolute measure of pressure, which means it’s used for identifying a total pressure including atmospheric pressure, but it’s not specific to measuring deep vacuums.
3. Inches of Hg (Inches of Mercury):
- Inches of Hg measures how high the column of mercury is displaced by a given pressure. While this unit can be used to measure vacuum, it is not the most precise unit for measuring very deep vacuums.
4. Microns:
- Microns are a much more precise unit used specifically to measure very low pressures, such as deep vacuums. 1 micron equals 1 micrometer (one-millionth of a meter) of mercury.
### Conclusion:
For measuring a deep vacuum, the most suitable and accurate unit is microns.
So, the correct answer is:
D. Microns
### Measurement Units Explained:
1. Psig (Pounds per Square Inch Gauge):
- Psig measures pressure relative to the surrounding atmospheric pressure. It’s used for pressures higher than atmospheric pressure, not for vacuums.
2. Psia (Pounds per Square Inch Absolute):
- Psia measures absolute pressure, which includes atmospheric pressure. It’s the absolute measure of pressure, which means it’s used for identifying a total pressure including atmospheric pressure, but it’s not specific to measuring deep vacuums.
3. Inches of Hg (Inches of Mercury):
- Inches of Hg measures how high the column of mercury is displaced by a given pressure. While this unit can be used to measure vacuum, it is not the most precise unit for measuring very deep vacuums.
4. Microns:
- Microns are a much more precise unit used specifically to measure very low pressures, such as deep vacuums. 1 micron equals 1 micrometer (one-millionth of a meter) of mercury.
### Conclusion:
For measuring a deep vacuum, the most suitable and accurate unit is microns.
So, the correct answer is:
D. Microns
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