At atmospheric pressure (14.7 psia), ammonia boils at?

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Study for the RETA Ammonia Refrigeration Exam with our immersive quizzes and multiple choice questions. Each question offers hints and explanations to prepare you for the certification exam!

Multiple Choice

At atmospheric pressure (14.7 psia), ammonia boils at?

Explanation:
Boiling point is the temperature at which a liquid’s vapor pressure equals the surrounding pressure. At atmospheric pressure (14.7 psia), ammonia’s normal boiling point is about -33°C, which is roughly -28°F. So, at 1 atm, ammonia begins to boil around -28°F: below that temperature it would be a liquid, and above it it tends to be a gas. The other temperatures are not the equilibrium point for 1 atm: 0°F is warmer than the boiling point, so ammonia would be a gas at that pressure, and the same idea applies to the other options.

Boiling point is the temperature at which a liquid’s vapor pressure equals the surrounding pressure. At atmospheric pressure (14.7 psia), ammonia’s normal boiling point is about -33°C, which is roughly -28°F. So, at 1 atm, ammonia begins to boil around -28°F: below that temperature it would be a liquid, and above it it tends to be a gas. The other temperatures are not the equilibrium point for 1 atm: 0°F is warmer than the boiling point, so ammonia would be a gas at that pressure, and the same idea applies to the other options.

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