ESCO Air Conditioning Practice Exam

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Water will vaporize at what temperature in a 28 inHg vacuum?

  1. 10°F

  2. 32°F

  3. 50°F

  4. 100°F

The correct answer is: 10°F

In a 28 inHg vacuum, water will vaporize at a lower temperature compared to standard atmospheric pressure conditions. This is due to the lower pressure in a vacuum which reduces the boiling point of water. At 28 inHg, water will vaporize at a lower temperature of 10°F. This phenomenon is commonly observed in vacuum systems where liquids can boil or evaporate at temperatures significantly below their normal boiling points at atmospheric pressure.

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