Contents

** Macroscopic and Microscopic Approaches Difference**

**Difference between ****Macroscopic Approaches and Microscopic Approaches ****with Comparison Chart**

**Summary:**

The Major **Difference between ****Macroscopic and Microscopic Approaches **is that in the **Microscopic approach,** it is used in **statistical thermodynamics**. **Macroscopic Approach**, this kind of approach is used in **classical thermodynamics.**

Every substance is composed of a large number of molecules. The properties of the substance depending on the behavior of these molecules. The behavior of a system may be investigated from either a **microscopic** (Micro means small) or **macroscopic** (Macro means big) point of view.

For applications involving lasers, plasmas, high-speed gas flows, chemical kinetics, very low temperatures (cryogenics), and others, the methods of statistical thermodynamics are essential.

**Comparison Chart**

Macroscopic Approach | Microscopic Approach |
---|---|

In this approach, a certain quantity of matter is considered without taking into account the events occurring at the molecular level. | The matter is considered to be comprised of a large number of tiny particles known as molecules, which move randomly in a disordered fashion. The effect of molecular motion is considered. |

An analysis is concerned with the overall behavior of the system. | Knowledge of the structure of matter is essential in analyzing the behavior of the system. |

This approach is used in the study of classical thermodynamics. | This approach is used in the study of statistical thermodynamics. |

A few properties are required to describe the system. | Large numbers of variables are required to describe the system. |

The properties like pressure, temperature, etc. needed to describe the system, can be easily measured. | The properties like velocity, momentum, kinetic energy, etc. needed to describe the system, cannot be measured easily. |

The properties of the system are their average values. | The properties are defined for each molecule individually. |

This approach requires simple mathematical formulas for analyzing the system. | No. of molecules is very large so it requires an advanced statistical and mathematical method to explain any change in the system |