Law

• law of thermodynamics

  (physics) a law governing the relations between states of energy in a closed...

• law of gravitation

  (physics) the law that states any two bodies attract each other with a force...

• Bose-Einstein statistics

  (physics) statistical law obeyed by a system of particles whose wave function...

• Dalton's law

  (chemistry and physics) law stating that the pressure exerted by a mixture of gases...

• Fermi-Dirac statistics

  (physics) law obeyed by a systems of particles whose wave function changes...

• Gay-Lussac's law

  (physics) the density of an ideal gas at constant pressure varies inversely with...

• Hooke's law

  (physics) the principle that (within the elastic limit) the stress applied to a solid...

• Kirchhoff's laws

  (physics) two laws governing electric networks in which steady currents flow: the...

• Planck's law

  (physics) the basis of quantum theory; the energy of electromagnetic waves is contained...

• Planck's radiation law

  (physics) an equation that expresses the distribution of energy in the radiated...

• principle of relativity

  (physics) a universal law that states that the laws of mechanics are not...

Mass

• rest mass

  (physics) the mass of a body as measured when the body is at rest relative to an observer,...

• relativistic mass

  (physics) the mass of a body in motion relative to the observer: it is equal to...

• gravitational mass

  (physics) the mass of a body as measured by its gravitational attraction for...

• inertial mass

  (physics) the mass of a body as determined by the second law of motion from the acceleration...

• mass energy

  (physics) the mass of a body regarded relativistically as energy.

Physical Property

• absorptivity

  (physics) the property of a body that determines the fraction of the incident radiation...

• reluctivity

  (physics) the resistance of a material to the establishment of a magnetic field in ...

Density

• flux

  (physics) the number of changes in energy flow across a given surface per unit area.

• optical density

  (physics) a measure of the extent to which a substance transmits light or other...

Property

• isotropy

  (physics) the property of being isotropic; having the same value when measured in different...

• duality

  (physics) the property of matter and electromagnetic radiation that is characterized by...

Rule

• mass-energy equivalence

  (physics) the principle that a measured quantity of mass is equivalent (according...

• principle of equivalence

  (physics) the principle that an observer has no way of distinguishing whether...

Also contains

• astronomy

  The branch of physics that studies celestial bodies and the universe as a whole.

• electronics

  The branch of physics that deals with the emission and effects of electrons and with...

• nuclear reactor

  (physics) any of several kinds of apparatus that maintain and control a nuclear...

• mechanics

  The branch of physics concerned with the motion of bodies in a frame of reference.

• magnet

  (physics) a device that attracts iron and produces a magnetic field.

• particle physics

  The branch of physics that studies subatomic particles and their interactions.

• optics

  The branch of physics that studies the physical properties of light.

• aeronautics

  The theory and practice of navigation through air or space.

• nuclear physics

  The branch of physics that studies the internal structure of atomic nuclei.

• quantum physics

  The branch of physics based on quantum theory.

• theory of gravitation

  (physics) the theory that any two particles of matter attract one another...

• biophysics

  Physics as applied to biological problems.

• cryogenics

  The branch of physics that studies the phenomena that occur at very low temperatures.

• attractor

  (physics) a point in the ideal multidimensional phase space that is used to describe a...

• phase space

  (physics) an ideal space in which the coordinate dimensions represent the variables...

• quantum

  (physics) the smallest discrete quantity of some physical property that a system can possess...

• containment

  (physics) a system designed to prevent the accidental release of radioactive material...

• field theory

  (physics) a theory that explains a physical phenomenon in terms of a field and the...

• crystallography

  The branch of science that studies the formation and structure of crystals.

• electromagnetism

  The branch of physics concerned with electromagnetic phenomena.

• electrostatics

  The branch of physics that deals with static electricity.

• hodoscope

  (physics) scientific instrument that traces the path of a charged particle.

• plasma physics

  The branch of physics concerned with matter in its plasma phase.

• meniscus

  (physics) the curved upper surface of a nonturbulent liquid in a vertical tube.

• metastability

  The quality of a physical system that persists in its existing equilibrium when undisturbed...

• Maxwell-Boltzmann distribution law

  (physics) a law expressing the distribution of energy among the...