Temperature glide is the difference between the bubble point and the dew point.

Temperature glide is the difference between the bubble point and the dew point.

• A. True
• B. False
• C. It is the difference between the boiling points of two components
• D. It is the heat transfer rate

Answer: (A)

Temperature glide is the difference between the temperatures where vapor–liquid equilibrium starts to boil and start to condense at the same pressure. The bubble point is the temperature at which the liquid first begins to vaporize, and the dew point is the temperature at which the vapor first begins to condense. For a pure substance, those temperatures align at a given pressure, so there’s no glide. For a mixture, non-ideal behavior often makes the bubble point and dew point different, creating a measurable glide. That’s why the statement is correct. It’s not about the difference between boiling points of two separate components, nor about heat transfer rate.

Temperature glide is the difference between the temperatures where vapor–liquid equilibrium starts to boil and start to condense at the same pressure. The bubble point is the temperature at which the liquid first begins to vaporize, and the dew point is the temperature at which the vapor first begins to condense. For a pure substance, those temperatures align at a given pressure, so there’s no glide. For a mixture, non-ideal behavior often makes the bubble point and dew point different, creating a measurable glide. That’s why the statement is correct. It’s not about the difference between boiling points of two separate components, nor about heat transfer rate.