Physics
Articles about matter, energy, forces and physical laws.
Thermodynamics
Thermodynamics: principles, laws, and applications
Third law of thermodynamics
Thou (unit)
Three-body problem
Three-body problem in classical mechanics
Thrust
Thrust: definition, measurement, and applications
Thrust is the force that moves a vehicle by accelerating mass in the opposite direction. This article explains its physics, units, history, common applications, and important disti
Thunder
Thunder (sound produced by lightning)
Tidal energy
Tidal energy: sources, technologies, history and impacts
Tidal force
Tidal force: differential gravity and its effects
Time
Time: concept, measurement, and scientific perspectives
A concise encyclopedia entry on time: what it is, how it is measured, its history, scientific formulation in relativity, and its role in daily life and science.
Time dilation
Time dilation: how motion and gravity alter the passage of time
Time-domain spectroscopy
Top quark
Torque
Torque (Moment of Force) — Physics and Engineering Overview
Torque is the rotational effect of a force about a point or axis. This article explains definitions, formulas, units, history, examples, and distinctions from related concepts.
Torsion (mechanics)
Trajectory
Trajectory (path of motion)
Transonic
Transonic flight and aerodynamics
Transparency
Transparency (optical properties of materials)
Transverse wave
Turbulence
Twin paradox
Two-body problem
Two-body problem (classical mechanics)
Tyndall effect
Ultra high frequency
Ultra High Frequency (UHF): properties, history, and common uses
Ultraviolet
Ultraviolet (UV) radiation
Ultraviolet catastrophe
Uncertainty principle
Undulator
Undulator: periodic magnet device for bright, tunable synchrotron radiation
Unit of measurement
Physical Measurement and Units: Systems, Standards, and SI Definitions
Up quark
Vacuum
Velocity
Velocity: vector measure of motion and its significance
Velocity is a vector quantity expressing how fast and in which direction an object moves. This article explains its definition, components, measurement, historical background, and
Venturi effect
Venturi effect: fluid speed, pressure changes, and practical uses
Vertical
Vibration
Viscosity
Visible spectrum
Visible spectrum: the portion of electromagnetic radiation seen as color
Volt
Volt (unit of electric potential)
Voltage
Volume
Vortex
Vortex: spinning fluid flows — types, physics, and examples
W and Z bosons
Warm
Warm (temperature, sensation, and uses)
Watt
Watt — SI unit of power
Wave
Wave (oscillation): types, properties, history and applications
Wave (physics)
Wave (physics): nature, types, properties and applications
Wave function
Wave–particle duality
Wave–particle duality: the quantum nature of light and matter