📚 Physics: The Fundamental Science of the Universe | 物理学：探索宇宙基本规律的科学
Physics is the discipline that searches for the most basic rules behind every natural phenomenon, from the smallest particle to the largest galaxy. It reveals the deep connections between matter, energy, space and time, and it gives us one of the most powerful frameworks humans have ever built for understanding the world.
物理学是探索一切自然现象背后最基本规律的学科，从最小的粒子到最大的星系，它揭示了物质、能量、空间与时间之间的深层联系，为人类理解世界提供了最有力的框架之一。
As one of the oldest sciences, physics has never been a narrow subject. It stretches across an enormous range of scales and connects microscopic and macroscopic events into a single picture of how nature works. This article reviews its origins, its classical foundations, its modern revolutions and its role in daily life and technology.
作为最古老的科学之一，物理学从来都不是一门狭隘的学科。它横跨极其广阔的尺度范围，把微观与宏观现象连接成一幅关于自然如何运作的统一图景。本文将回顾物理学的起源、经典基石、现代革命，以及它在日常生活与技术中的作用。
1. What Physics Studies | 物理学研究什么
Physics is the branch of science that investigates the most fundamental laws governing the universe, asking not only what happens but why it happens.
物理学是研究宇宙最基本规律的学科，它不仅追问"发生了什么"，更追问"为什么会发生"。
Its central concern is the relationship between matter, energy, space and time. Every object, from an electron to a star, exists within this relationship, and physics tries to describe it with the smallest possible number of principles.
它的核心关切是物质、能量、空间与时间之间的关系。从电子到恒星，每一个物体都存在于这种关系之中，而物理学试图用尽可能少的原则去描述它。
Physics is one of the oldest sciences and remains a core framework for understanding the world. It does not replace chemistry or biology; rather, it provides the underlying rules on which those subjects depend.
物理学是最古老的科学之一，也是理解世界的核心框架。它并不取代化学或生物学，而是为这些学科提供所依赖的底层规律。
A key idea in A-Level physics is that physical quantities must be measured and expressed with units. For example, speed is measured in metres per second (m s⁻¹), force in newtons (N), energy in joules (J), and charge in coulombs (C).
A-Level 物理中的一个关键理念是：物理量必须用单位和数值共同表达。例如，速度的单位是米每秒（m s⁻¹），力的单位是牛顿（N），能量的单位是焦耳（J），电荷的单位是库仑（C）。
- Scalar quantities have magnitude only, such as mass, time and temperature. 标量只有大小，如质量、时间和温度。
- Vector quantities have magnitude and direction, such as displacement, velocity, acceleration and force. 矢量既有大小又有方向，如位移、速度、加速度和力。
- Dimensional analysis can check whether an equation is plausible. 量纲分析可以检验一个方程是否合理。
2. The Extraordinary Scope of Physics | 物理学的广阔研究范围
Physics covers an extraordinarily wide territory. It ranges from reactions inside the atomic nucleus to the evolution of galaxy clusters, and every step in between depends on physical explanation.
物理学涵盖极其广阔的领域。从原子核内部的反应到星系团的演化，其间的每一个环节都依赖物理解释。
It crosses scales: the quantum world of particles, the everyday world of objects, the planetary world of orbits, and the cosmic world of galaxies and the expanding universe.
它穿越各种尺度：粒子的量子世界、物体的日常世界、行星轨道的世界，以及星系与膨胀宇宙的宇宙世界。
By connecting microscopic and macroscopic phenomena, physics allows us to glimpse the blueprint of nature. The same laws that describe how an electron behaves in an atom also help us understand how stars produce light.
通过连接微观与宏观现象，物理学让我们得以窥见自然的蓝图。描述原子中电子行为的规律，同样帮助我们理解恒星如何发光。
This unity is one of the most remarkable features of physics. A small set of principles, tested in laboratories on Earth, can be applied to objects billions of light years away.
这种统一性是物理学最引人注目的特征之一。少量在地球实验室中检验过的原理，可以应用于数十亿光年之外的物体。
3. Ancient Greek Origins | 古希腊的思想源头
The origins of physics can be traced back to ancient Greece, where philosophers tried to explain natural phenomena through rational thought rather than myth alone.
物理学的源头可以追溯到古希腊时期，当时的先哲试图通过理性思辨而非单纯神话来解释自然现象。
Thinkers such as Thales, Democritus, Aristotle and Archimedes asked questions about motion, matter and the structure of the
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