Science & Physics

Sound propagation is the process by which acoustic energy travels through a medium as a mechanical wave, transferring pressure variations from one particle to the next. This gui...

A gravity connection describes any situation in which systems, structures, or processes are linked by the influence of gravity. In practical terms, it spans how weights, loads,...

The sun rises in the east under ordinary conditions. It can appear to rise in the west during a mirage, near an atmospheric duct or inversion layer, or on fast-rotating planets...

Sound can break glass when the pressure variations from a loud enough tone match the glass’s natural resonant frequency, concentrating energy into the material. At resonance,...

Many people ask whether thermal energy is hot or cold because the words heat, temperature, and thermal energy are used interchangeably in everyday talk. In physics and engineeri...

Albert Einstein (1879–1955) was a German-born theoretical physicist who revolutionized our understanding of space, time, gravity, and energy. Best known for the mass–energy...

Sound waves require a medium because they are mechanical vibrations that travel by making particles in a material knock into one another. In air, water, or solids, these collisi...

At the center of nearly every practical question about matter and electricity lies a simple relationship between two subatomic particles: protons and electrons. This guide expla...

Annihilation describes the process in which a particle and its corresponding antiparticle meet and convert their combined mass into energy, typically producing photons or other...

You can tell that sound travels through solids by observing that vibrations passing through a solid object reach your ear or a device more clearly and quickly than through air a...