At a pressure of 0.18 inHg, what temperature does the water produce steam?

The boiling point of water decreases as the atmospheric pressure decreases. At sea level, where the standard atmospheric pressure is approximately 29.92 inHg, water boils at 212°F (100°C). However, as the pressure drops, such as at 0.18 inHg, the boiling point of water will also be significantly lower.

At a pressure of 0.18 inHg, water would boil at a much lower temperature than it would at standard atmospheric pressure. In fact, at this low pressure, water can produce steam at around 32°F (0°C), which is the freezing point of water. Thus, this would be the correct answer, as it aligns with the principles of boiling point and vaporization at lower pressures.

This understanding of the relationship between pressure and the boiling point of water is crucial for various applications in steamfitting and related fields, where accurate pressure and temperature relationships are essential for system design and safety.