The states of matter are the main physical forms a substance can take—solid, liquid, gas, and plasma—based on how tightly its particles are held together and how freely they move.[a]🔗 A Clear Way to Think About It Solids keep their shape, liquids keep their volume, gases expand to fill space, and plasma behaves like a gas with charged particles that react strongly to electric and…
Electromagnetism is the force behind electric charge and magnetism; gravity is the attraction linked to mass and energy and, in modern physics, to the shape of spacetime. Both can reach across huge distances, yet they behave so differently that one builds atoms while the other builds galaxies. A Clear Starting Point Electromagnetism usually dominates at human scales because it can be extremely strong between charged…
The speed of light (usually written as c) is the maximum speed at which information, energy, and physical influence can travel through empty space. In modern SI units, it is defined to be exactly 299,792,458 meters per second in a vacuum[a]↗[b]↗. A Clear Starting Point Light feels “instant” at human distances, but physics treats it as a real speed with real consequences. The important part…
Newton’s three laws of motion are three simple rules that connect forces to how objects move: (1) motion doesn’t change unless there is a net force, (2) net force sets the object’s acceleration, and (3) forces always come in equal-and-opposite pairs between interacting objects.[a]↗ A Clear Mental Picture These laws don’t replace common sense; they sharpen it. They explain why a smooth-gliding object keeps going,…
The four laws of thermodynamics are the basic rules that connect temperature, heat, work, and entropy. They explain why thermometers can agree, why energy accounting always balances, why some changes have a clear “direction,” and why absolute zero is a limit you can approach but not reach in practice.[g]↗ A Clear Starting Point Thermodynamics is about energy moving and energy changing form in systems you…
The periodic table is a map of all known chemical elements arranged by atomic number (the number of protons). Its layout is designed so elements with similar behavior line up in vertical columns called groups, while horizontal rows called periods reflect repeating patterns in electron structure.[e] 🔗 A Clean Overview Before We Go Deeper When people say “groups and properties,” they usually mean one idea:…
Einstein’s theory of relativity is a set of ideas that ties space, time, mass, and energy into one picture. The famous equation E = mc² says that a body has “rest energy” simply by having mass—no motion required. A Practical Way to Read Relativity Relativity doesn’t mean “everything is random.” It means the laws of physics work the same way for everyone who’s not accelerating,…
Quantum physics is the science of how nature behaves at the smallest scales—atoms, electrons, light, and the fundamental particles beneath everyday materials. It replaces the classical idea of a world made of tiny billiard balls with a world described by probabilities, waves, and discrete (quantized) chunks. A Clear Starting Point Quantum ideas can feel strange because they don’t match how large objects behave. But the…
An atom is the smallest particle that still represents a chemical element: a tiny, positively charged nucleus (made of protons and usually neutrons) with electrons around it shaping the atom’s size and behavior.[b]🔗 A Clear Picture Before the Details Atoms look simple on paper, yet they explain why matter has identity (which element it is), charge (neutral or ion), and patterns (how substances react and…