Question

Which of the following pairs contains only intensive properties?

• A. Mass, Volume
• B. Density, Temperature
• C. Volume, Pressure
• D. Mass, Density

Hint:

A quick way to remember: If a property changes when the size of the system changes, it is \textbf{extensive}. If it remains the same regardless of system size, it is \textbf{intensive}. Examples: Extensive → Mass, Volume Intensive → Temperature, Pressure, Density

Answer 1

The Correct Option is B

Concept: Thermodynamic properties are classified into two types:

• Extensive Properties: These depend on the amount of substance present. Examples: Mass, Volume, Internal Energy.
• Intensive Properties: These do not depend on the amount of substance. Examples: Temperature, Pressure, Density.

Thus, intensive properties remain the same regardless of system size.
Step 1: {Check each option based on property type.}

• Mass → Extensive property
• Volume → Extensive property

Therefore, option (A) is incorrect.
Step 2: {Evaluate the second option.}

• Density → Intensive property
• Temperature → Intensive property

Both are intensive properties.
Step 3: {Check remaining options.}

• Volume → Extensive
• Mass → Extensive

Since these options include extensive properties, they are incorrect. Hence, the correct pair containing only intensive properties is Density and Temperature.