natural phenomenon - all non-artificial phenomena

acoustic phenomenon - a physical phenomenon associated with the production or transmission of sound

atmospheric phenomenon - a physical phenomenon associated with the atmosphere

boundary layer - the layer of slower flow of a fluid past a surface

chaos - the formless and disordered state of matter before the creation of the cosmos

cloud - any collection of particles (e.g., smoke or dust) or gases that is visible

decalescence - phenomenon that occurs when a metal is being heated and there is a sudden slowing in the rate of temperature increase; slowing is caused by a change in the internal crystal structure of the metal

electrical phenomenon - a physical phenomenon involving electricity

electricity - a physical phenomenon associated with stationary or moving electrons and protons

energy - (physics) the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"

power - (physics) the rate of doing work; measured in watts (= joules/second)

event - a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory

field of force, force field, field - the space around a radiating body within which its electromagnetic oscillations can exert force on another similar body not in contact with it

force - (physics) the influence that produces a change in a physical quantity; "force equals mass times acceleration"

hysteresis - the lagging of an effect behind its cause; especially the phenomenon in which the magnetic induction of a ferromagnetic material lags behind the changing magnetic field

resonance - an excited state of a stable particle causing a sharp maximum in the probability of absorption of electromagnetic radiation

mechanical phenomenon - a physical phenomenon associated with the equilibrium or motion of objects

opacity - the phenomenon of not permitting the passage of electromagnetic radiation

optical phenomenon - a physical phenomenon related to or involving light

force per unit area, pressure, pressure level - the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit); "the compressed gas exerts an increased pressure"

reflexion, reflection - the phenomenon of a propagating wave (light or sound) being thrown back from a surface

refraction - the change in direction of a propagating wave (light or sound) when passing from one medium to another

resolving power, resolution - the ability of a microscope or telescope to measure the angular separation of images that are close together

resolution - (computer science) the number of pixels per square inch on a computer-generated display; the greater the resolution, the better the picture

conduction, conductivity - the transmission of heat or electricity or sound

propagation - the movement of a wave through a medium

fundamental interaction, interaction - (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons

surface tension - a phenomenon at the surface of a liquid caused by intermolecular forces

syzygy - the straight line configuration of 3 celestial bodies (as the sun and earth and moon) in a gravitational system

transparence, transparency - permitting the free passage of electromagnetic radiation

turbulence, turbulency - unstable flow of a liquid or gas

floatation, flotation - the phenomenon of floating (remaining on the surface of a liquid without sinking)