Question

Which among the following is NOT an extensive property?

• A. Mass
• B. Volume
• C. Pressure
• D. Internal energy

Hint:

A simple trick: If you split a system in half, extensive properties (like volume and mass) are halved, while intensive properties (like pressure, temperature, and concentration) remain exactly the same!

Answer 1

The Correct Option is C

Step 1: Meaning of extensive.
An extensive property changes when the amount of matter changes. More matter gives a bigger value.
Step 2: Meaning of intensive.
An intensive property stays the same no matter how much matter you have. Temperature and pressure are good examples.
Step 3: Test mass.
Mass is the amount of matter itself, so more matter means more mass. Mass is extensive.
Step 4: Test volume and internal energy.
Volume grows as you add more substance, so it is extensive. Internal energy is the total energy of all particles, so it also grows with amount and is extensive.
Step 5: Test pressure.
If you split a gas container into two halves, each half still has the same pressure as before. Pressure does not depend on amount, so it is intensive.
Step 6: Final choice.
The property that is NOT extensive is pressure, which is option 3.
\[ \boxed{\text{Pressure}} \]