#law_of_nature__law  a generalization that describes recurring facts or events in nature: "the laws of thermodynamics"
  supertype:  concept__conception__construct  an abstract or general idea inferred or derived from specific instances
  part of:  theory
  subtype:  all-or-none_law__allornonelaw  (neurophysiology) a nerve impulse resulting from a weak stimulus is just as strong as a nerve impulse resulting from a strong stimulus
  subtype:  principle.law_of_nature__rule  a rule or law concerning a natural phenomenon or the function of a complex system: "the principle of the conservation of mass"; "the principle of jet propulsion"; "the right-hand rule for inductive fields"
     subtype:  Le_Chatelier's_principle__Le_Chatelier's_law__Le_Chatelier_principle__Le_Chatelier-Braun_principle  the principle that if any change is imposed on a system that is in equilibrium then the system tends to adjust to a new equilibrium counteracting the change
     subtype:  Gresham's_Law  (economics) the principle that when two kinds of money having the same denominational value are in circulation the intrinsically more valuable money will be hoarded and the money of lower intrinsic value will circulate more freely until the intrinsically more valuable money is driven out of circulation; bad money drives out good; credited to Sir Thomas Gresham
     subtype:  Naegele's_rule  rule for calculating an expected delivery date; subtract three months from the first day of the last menstrual period and add seven days to that date
     subtype:  Occam's_Razor__Ockham's_Razor__principle_of_parsimony__law_of_parsimony  the principle that entities should not be multiplied needlessly; the simplest of two competing theories is to be preferred
     subtype:  principle_of_equivalence  (physics) the principle that an observer has no way of distinguishing whether his laboratory is in a uniform gravitational field or is in an accelerated frame of reference
     subtype:  principle_of_liquid_displacement  (hydrostatics) the volume of a body immersed in a fluid is equal to the volume of the displaced fluid
     subtype:  Huygens'_principle_of_superposition__principle_of_superposition  the displacement of any point due to the superposition of wave systems is equal to the sum of the displacements of the individual waves at that point; "the principle of superposition is the basis of the wave theory of light"
     subtype:  mass-action_principle__mass_action  (neurology) the principle that the cortex of the brain operates as a coordinated system with large masses of neural tissue involved in all complex functioning
     subtype:  localization_of_function__localisation_of_function__localization_principle__localisation_principle__localization__localisation  (neurology) the principle that specific functions have relatively circumscribed locations in the cortex of the brain
        subtype:  lateralization__lateralisation__laterality  localization of function on either the right or left sides of the brain
  subtype:  Archimedes'_principle__law_of_Archimedes  (hydrostatics) the apparent loss in weight of a body immersed in a fluid is equal to the weight of the displaced fluid
  subtype:  Avogadro's_law__Avogadro's_hypothesis  the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules
  subtype:  Bernoulli's_law__law_of_large_numbers  (statistics) law stating that a large number of items taken at random from a population will (on the average) have the population statistics
  subtype:  Bose-Einstein_statistics  (physics) statistical law obeyed by a system of particles whose wave function is not changed when two particles are interchanged (the Pauli exclusion principle does not apply)
  subtype:  Boyle's_law__Mariotte's_law  the pressure of an ideal gas at constant temperature varies inversely with the volume
  subtype:  Coulomb's_Law  a fundamental principle of electrostatics; the force of attraction or repulsion between two charged particles is directly proportional to the product of the charges and inversely proportional to the distance between them; principle also holds for magnetic poles
  subtype:  Dalton's_law_of_partial_pressures__Dalton's_law__law_of_partial_pressures  (chemistry and physics) law stating that the pressure exerted by a mixture of gases equals the sum of the partial pressures of the gases in the mixture; the pressure of a gas in a mixture equals the pressure it would exert if it occupied the same volume alone at the same temperature
  subtype:  distribution_law  (chemistry) the total energy in an assembly of molecules is not distributed equally but is distributed around an average value according to a statistical distribution
     subtype:  Maxwell-Boltzmann_distribution_law__Boltzmann_distribution_law  (physics) a law expressing the distribution of energy among the molecules of a gas in thermal equilibrium
  subtype:  equilibrium_law__law_of_chemical_equilibrium  (chemistry) the principle that (at chemical equilibrium) in a reversible reaction the ratio of the rate of the forward reaction to the rate of the reverse reaction is a constant for that reaction
  subtype:  Fechner's_law__Weber-Fechner_law  (psychophysics) the concept that the magnitude of a subjective sensation increases proportional to the logarithm of the stimulus intensity; based on early work by E. H. Weber
  subtype:  Fermi-Dirac_statistics  (physics) law obeyed by a systems of particles whose wave function changes when two particles are interchanged (the Pauli exclusion principle applies)
  subtype:  Gay-Lussac's_law__Charles'_law__law_of_volumes  the density of an ideal gas at constant pressure varies inversely with the temperature
  subtype:  Henry's_law  (chemistry) law formulated by the English chemist William Henry; the amount of a gas that will be absorbed by water increases as the gas pressure increases
  subtype:  Hooke's_law  (physics) the principle that (within the elastic limit) the stress applied to a solid is proportional to the strain produced
  subtype:  Hubble's_law__Hubble_law  (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer
  subtype:  Kepler's_law_of_planetary_motion__Kepler's_law  (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler
     subtype:  Kepler's_first_law  a law stating that the orbit of each planet is an ellipse with the sun at one focus of the ellipse
     subtype:  Kepler's_second_law__law_of_areas__law_of_equal_areas  a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times; "Kepler's second law means that a planet's orbital speed changes with its distance from the sun"
     subtype:  Kepler's_third_law__harmonic_law  a law stating that the ratio of the square of the revolutionary period (in years) to the cube of the orbital axis (in astronomical units) is the same for all planets
  subtype:  Kirchhoff's_laws  (physics) two laws governing electric networks in which steady currents flow: (1) the sum of all the currents at a point is zero; (2) the sum of the voltage gains and drops around any closed circuit is zero
  subtype:  law_of_averages  a law affirming that in the long run probabilities will determine performance
  subtype:  law_of_constant_proportion__law_of_definite_proportions  (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight
  subtype:  law_of_diminishing_returns  a law affirming that to continue after a certain level of performance has been reached will result in a decline in effectiveness
  subtype:  law_of_effect  (psychology) the principle that behaviors are selected by their consequences; behavior having good consequences tends to be repeated whereas behavior that leads to bad consequences is not repeated
  subtype:  law_of_equivalent_proportions__law_of_reciprocal_proportions  (chemistry) law stating that the proportions in which two elements separately combine with a third element are also the proportions in which they combine together
  subtype:  Newton's_law_of_gravitation__newton'slawofgravitation__law_of_gravitation  (physics) the law that states any two bodies attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them
  subtype:  law_of_multiple_proportions__Dalton's_law  (chemistry) law stating that when two elements can combine to form more than one compound the amounts of one of them that combines with a fixed amount of the other will exhibit a simple multiple relation
  subtype:  law_of_mass_action  (chemistry) the law that states the following principle: the rate of a chemical reaction is directly proportional to the molecular concentrations of the reacting substances
  subtype:  law_of_thermodynamics  (physics) a law governing the relations between states of energy in a closed system
     subtype:  second_law_of_thermodynamics  a law stating that mechanical work can be derived from a body only when that body interacts with another at a lower temperature; any spontaneous process results in an increase of entropy
     subtype:  third_law_of_thermodynamics  law stating that the entropy of a substance approaches zero as its temperature approaches absolute zero
     subtype:  zeroth_law_of_thermodynamics  the law that if two bodies are in thermal equilibrium with a third body then the first two bodies are in thermal equilibrium with each other
     subtype:  law_of_conservation_of_energy__conservation_of_energy__first_law_of_thermodynamics  the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
  subtype:  Mendel's_law  (genetics) one of two principles of heredity formulated by Gregor Mendel on the basis of his experiments with plants; the principles were limited and modified by subsequent genetic research
     subtype:  law_of_segregation  members of a pair of homologous chromosomes separate during the formation of gametes and are distributed to different gametes so that every gamete receives only one member of the pair
     subtype:  law_of_independent_assortment  each member of a pair of homologous chromosomes separates independently of the members of other pairs so the results are random
  subtype:  Newton's_law_of_motion__Newton's_law__law_of_motion  one of three basic laws of classical mechanics
     subtype:  Newton's_first_law_of_motion__first_law_of_motion__Newton's_first_law  a body remains at rest or in motion with a constant velocity unless acted upon by an external force
     subtype:  Newton's_second_law_of_motion__second_law_of_motion__Newton's_second_law  the rate of change of momentum is proportional to the imposed force and goes in the direction of the force
     subtype:  Newton's_third_law_of_motion__third_law_of_motion__Newton's_third_law__law_of_action_and_reaction  action and reaction are equal and opposite
  subtype:  Ohm's_law  electric current is directly proportional to voltage and inversely proportional to resistance; I = E/R
  subtype:  Pascal's_law_of_fluid_pressures__Pascal's_law  pressure applied anywhere to a body of fluid causes a force to be transmitted equally in all directions; the force acts at right angles to any surface in contact with the fluid; "the hydraulic press is an application of Pascal's law"
  subtype:  Pauli_exclusion_principle__exclusion_principle  no two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers
  subtype:  periodic_law__Mendeleev's_law  (chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers
  subtype:  Planck's_law  (physics) the basis of quantum theory; the energy of electromagnetic waves is contained in indivisible quanta that have to be radiated or absorbed as a whole; the magnitude is proportional to frequency where the constant of proportionality is give by Planck's constant
  subtype:  Planck's_radiation_law  (physics) an equation that expresses the distribution of energy in the radiated spectrum of an ideal black body
  subtype:  principle_of_relativity  (physics) a universal law that states that the laws of mechanics are not affected by a uniform rectilinear motion of the system of coordinates to which they are referred
  subtype:  Weber's_law  (psychophysics) the concept that a just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus; "Weber's law explains why you don't notice your headlights are on in the daytime"

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