The**key difference**between quantum physics and quantum mechanics is that**量子物理学是科学的一个分支,热点s on quantum mechanics whereas quantum mechanics is the set of principals used to explain the behaviour ofmatter and energy.**

People use the terms ‘quantum physics’ and ‘quantum mechanics’ with different meanings. Although we sometimes use these terms to describe the same thing, there is a difference between quantum physics and quantum mechanics. We can identify quantum physics as a branch of science that study theories like quantum mechanics and quantum field theory. In other words, mechanics is a set of theories we study in the branch of science known as physics.

### CONTENTS

1.Overview and Key Difference

2.What is Quantum Physics

3.What is Quantum Mechanics

4.Side by Side Comparison – Quantum Physics vs Quantum Mechanics in Tabular Form

5.概括

## What is Quantum Physics?

Quantum physics is a branch of science that focuses on systems explained by theories such as quantum mechanics and quantum field theory. Scientists and researchers focus on this area in order to use this knowledge to understand the behaviour of particles at the subatomic level. However, sometimes we use the terms “quantum physics” and “quantum mechanics” interchangeably.

## 什么是量子力学？

Quantum mechanics is the set of principle that explains the behaviour of matter at atomic (or subatomic) scale. The word ‘quantum’ itself describes a fundamental concept of quantum mechanics – the quantized or discrete nature of matter and energy.

Quantum mechanics was born when Max Plank introduced the concept of quantized energy (E =nhf) to explain theblackbody热辐射。然后，爱因斯坦提出了'photon’ to explain the particle nature of light. It led to a theory known as ‘wave-particle duality’, which describes the possession of both ‘wave’ and ‘particle’ qualities by matter and energy. Louis de Broglie introduced this concept.

Fundamental concepts of quantum mechanics also includeBohr modelsto describe atomic structure by Niels Bohr, Schrödinger equation (widely used equation to calculate quantum waves) by Erwin Schrödinger, uncertainty principle (which explains the probabilistic nature of matter and energy) by Werner Heisenberg, and Pauli Exclusion Principle by Wolfgang Pauli. The explanation known as Copenhagen interpretation and the phenomenon known as quantum entanglement also belong to the quantum mechanics.

## What is the Difference Between Quantum Physics and Quantum Mechanics?

Quantum physics is a major branch of science while quantum mechanics is a branch of quantum physics. So, the key difference between quantum physics and quantum mechanics is that quantum physics is a branch of science that focuses on quantum mechanics whereas quantum mechanics is the set of principals that explain the behaviour of matter and energy.

Furthermore, quantum physics can predict and describe the properties of a physical system while quantum mechanics can describe properties of molecules, atoms and subatomic particles regarding the interactions between them and with electromagnetic radiation. Therefore, this is the difference between quantum physics and quantum mechanics in terms of their usage.

## 概括– Quantum Physics vs Quantum Mechanics

尽管我们互换使用量子物理学和量子力学术语，但它们彼此不同。量子物理学和量子力学之间的关键区别在于，量子物理学是科学的一个分支，侧重于量子力学，而量子力学是一组主体，它解释了物质和能量的行为。

##### Reference:

1. Squires, Gordon Leslie. “*Quantum Mechanics*.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 3 Aug. 2018,Available here.

##### Image Courtesy:

1. “3871213” (CC0) viaPixabay

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