Prepare for the HVAC 403A Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

If pressure acting on a liquid is increased, the boiling point will

When pressure on a liquid increases, its boiling point rises because boiling occurs when the liquid’s vapor pressure equals the surrounding pressure. If the external pressure is higher, the liquid must be heated to a higher temperature to reach the same vapor pressure, so the temperature at which it boils must increase. For example, in a pressure cooker, the surrounding pressure is higher, so water boils at temperatures above 100°C, allowing faster cooking. The boiling point wouldn’t stay the same or decrease with higher pressure, and boiling won’t occur spontaneously just because the pressure is higher.

When pressure on a liquid increases, its boiling point rises because boiling occurs when the liquid’s vapor pressure equals the surrounding pressure. If the external pressure is higher, the liquid must be heated to a higher temperature to reach the same vapor pressure, so the temperature at which it boils must increase. For example, in a pressure cooker, the surrounding pressure is higher, so water boils at temperatures above 100°C, allowing faster cooking. The boiling point wouldn’t stay the same or decrease with higher pressure, and boiling won’t occur spontaneously just because the pressure is higher.