Learn about the four states of matter, the kinetic theory of matter, and how it relates to how matter is able to change from one phase to another.

In 1690, scientist Christian Huygens published his wave theory of light. This theory was in contrast with the particle theory of light suggested by Sir Isaac Newton and others.

Understand what wave particle duality is by learning its definition. Know how light behaves like a particle and see evidence that light is a particle.

Learn about simple particle theory with our bite-sized video lesson designed for kids! Watch now and enhance your understanding with an optional quiz.

Understand kinetic molecular theory and see how it explains the kinetic energy in solids, liquids, & gases. Study how it interacts with gas laws, and view examples.

A particle is a small, discrete point-like piece of matter or energy. This could be an atom or electron in particle physics, or a car or a shopping cart in an engineering study.

Collision theory describes chemical reactions in terms of particle collisions between reactants. These collisions, if successful, lead to the formation of product particles.

Jul 8, 2025 · The theory explained light behavior through mechanical interactions between particles and matter. What effect was discovered that made scientists revive some aspects of the corpuscular …

Learn about Democritus' atomic theory and model. Explore the work of Democritus, the scientist of ancient Greece who proposed the most accurate model of the atom. Discover competing theories of ...

Jun 27, 2025 · Quantum Field Theory (QFT) is essentially the framework that supports modern particle physics. The theory describes how particles and forces interact at the smallest scales of nature, …