Extensive and Intensive Properties

Extensive and Intensive Properties of Matter

Properties of matter are classified into extensive and intensive based on their dependency on the quantity of matter.

1. Extensive Properties

Definition:
Extensive properties depend on the amount of matter present in the system. These properties change proportionally with the size or extent of the system.

Key Features:

• Vary with the quantity of matter.

• Additive (e.g., if you combine two systems, the total property is the sum of individual values).

Examples:

• Mass: The total quantity of matter in an object.

• Volume: The space occupied by the matter.

• Length: A measure of one dimension of matter.

• Total Energy: Includes kinetic and potential energy of a system.

• Heat Capacity: Total energy required to change the temperature of the entire system.

2. Intensive Properties

Definition:
Intensive properties do not depend on the amount of matter. These properties remain the same regardless of the size of the system.

Key Features:

• Independent of quantity.

• Not additive (remains constant even if the system size changes).

Examples:

• Density: Mass per unit volume (e.g., Density=MassVolume\text{Density} = \frac{\text{Mass}}{\text{Volume}}Density=VolumeMass​).

• Temperature: Indicates the thermal state of matter.

• Pressure: Force exerted per unit area.

• Melting Point: The temperature at which a substance changes from solid to liquid.

• Boiling Point: The temperature at which a liquid turns into vapor.

• Refractive Index: A measure of how light bends when it passes through the material.

• Viscosity: Resistance to flow in a fluid.

• Specific Heat Capacity: Heat required to raise the temperature of 1 unit mass by 1°C