Question

Dynamic Vapour Sorption (DVS) isotherm is a plot of A versus B

• A. A - Crystallization Peak Energy (J/g) B - Percentage Relative Humidity
• B. A - Percentage Change in Mass B - Percentage Relative Humidity
• C. A Crystallization Peak Energy (J/g) B- Amorphous Content
• D. A - Crystallization Peak Energy (J/g) B - Percentage Change in Mass

Answer 1

The Correct Option is B

Dynamic Vapour Sorption (DVS) is a technique used to analyze how a sample material interacts with water vapor. This is particularly useful in fields like material science and pharmaceuticals for determining the properties of a material concerning humidity.

A DVS isotherm is a plot that shows the relationship between the change in mass of a material and the percentage of relative humidity the material is exposed to. Let's analyze the options given:

1. Option 1: Crystallization Peak Energy (J/g) vs. Percentage Relative Humidity
   Reason: This is incorrect since DVS focuses on the change in mass, not energy peaks.
2. Option 2: Percentage Change in Mass vs. Percentage Relative Humidity
   Reason: This is the correct relationship. DVS measures how much the mass of a material changes (often due to water absorption or desorption) as the relative humidity changes. Hence, this plot shows the percentage change in mass against the percentage of relative humidity.
3. Option 3: Crystallization Peak Energy (J/g) vs. Amorphous Content
   Reason: This does not relate to DVS isotherms which are concerned with mass and humidity, not amorphous content or peak energy.
4. Option 4: Crystallization Peak Energy (J/g) vs. Percentage Change in Mass
   Reason: This is not applicable to DVS. Although mass change is relevant, DVS focuses on humidity as the axis of comparison, not energy peaks.

Therefore, the correct answer is Option 2: A - Percentage Change in Mass, B - Percentage Relative Humidity.