Heat Is Added to a Pure Substance in a Closed

question 37

Multiple Choice

Heat is added to a pure substance in a closed container at a constant rate. The figure shows a graph of the temperature of the substance as a function of time. If L_f = latent heat of fusion and L_v = latent heat of vaporization, what is the value of the ratio L_v / L_f for this substance?

• A) 5.0
• B) 4.5
• C) 7.2
• D) 3.5
• E) 1.5

---

Definitions:

Set Point

A concept used to describe the level at which various physiological measures tend to stabilize within an individual over time.

Body Weight

The weight of a person, usually quantified in either kilograms or pounds.

Insulin

A secretion from the pancreas that plays a key role in controlling blood glucose concentrations by assisting in the transportation of glucose into the cells.

Pima Indians

A Native American group primarily living in Arizona, known for their unique genetic makeup which has been extensively studied in diabetes research.