Which among the following is an intensive property?

Options

A. Enthalpy
B. Entropy
C. Gibbs free energy
D. Pressure

Answer

To determine which among the given options is an intensive property, we first need to understand the definitions of intensive and extensive properties.

### Step 1: Define Intensive and Extensive Properties
- **Intensive Properties**: These properties do not depend on the amount of substance present. Examples include temperature, pressure, density, and color.
- **Extensive Properties**: These properties depend on the amount of substance present. Examples include mass, volume, enthalpy, and entropy.

### Step 2: Analyze the Given Options
Let's analyze the properties mentioned in the question:
1. **Enthalpy (H)**: Enthalpy is an extensive property because it depends on the amount of substance (n). The formula for enthalpy change is ΔH = nCpΔT, where n is the number of moles.

2. **Entropy (S)**: Entropy is also an extensive property as it depends on the amount of substance. The formula for entropy change involves n as well.

3. **Gibbs Free Energy (G)**: Gibbs free energy is another extensive property since it also depends on the number of moles (n) of the substance.

4. **Pressure (P)**: Pressure is defined as force per unit area. Although force and area are extensive properties, the ratio of two extensive properties (force and area) results in an intensive property. Therefore, pressure is an intensive property.

### Step 3: Conclusion
Based on the analysis above, the property that is intensive among the given options is **Pressure**.

### Final Answer
The intensive property among the given options is **Pressure**.

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