Which one of the following is not an intensive property?

Options

A. Pressure
B. Concentration
C. Density
D. Volume

Answer

To determine which of the following is not an intensive property, we need to first understand the definitions of intensive and extensive properties.

### Step-by-Step Solution:

1. **Define Intensive and Extensive Properties**:
- **Intensive Properties**: These are properties that do not depend on the amount of substance present. They remain constant regardless of the size or mass of the material. Examples include temperature, pressure, density, and concentration.
- **Extensive Properties**: These properties depend on the amount of substance present. They change when the size or mass of the material changes. Examples include mass, volume, and total energy.

2. **Analyze the Given Options**:
- **Pressure**: Pressure is defined as force per unit area. It is derived from extensive properties (force and area), but the ratio of two extensive properties results in an intensive property. Therefore, pressure is an intensive property.
- **Concentration**: Concentration (like molarity) is defined as the amount of solute per unit volume of solution. Since both the solute and the solution volume are extensive properties, their ratio (concentration) is an intensive property.
- **Density**: Density is defined as mass per unit volume. Both mass and volume are extensive properties, and their ratio gives an intensive property. Thus, density is also an intensive property.
- **Volume**: Volume is a measure of the space occupied by a substance and is directly proportional to the amount of substance present. Therefore, volume is an extensive property.

3. **Conclusion**:
- Among the options provided, volume is the only property that is not intensive; it is an extensive property. Thus, the correct answer is **volume**.

### Final Answer:
**Volume** is not an intensive property.

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