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constant US English

Occurring continuously over a period of time

rate constant US English

A coefficient of proportionality relating the rate of a chemical reaction at a given temperature to the concentration of reactant (in a unimolecular reaction) or to the product of the concentrations of reactants

time constant US English

A time that represents the speed with which a particular system can respond to change, typically equal to the time taken for a specified parameter to vary by a factor of 11e (approximately 0.6321)

gas constant US English

The constant of proportionality in the gas equation. It is equal to 8.314 joule kelvin1 mole1

solar constant US English

The rate at which energy reaches the earth’s surface from the sun, usually taken to be 1,388 watts per square meter

Planck's constant US English

A fundamental constant, equal to the energy of a quantum of electromagnetic radiation divided by its frequency, with a value of 6.626 × 1034 joule-seconds

Rydberg constant US English

A constant, 1.097 x 107 m−1, that appears in the formulae for the wave numbers of lines in atomic spectra and is a function of the rest mass and charge of the electron, the speed of light, and Planck’s constant

coupling constant US English

A measure of the strength of interaction between two particles, or between a particle and a field

Euler's constant US English

A constant used in numerical analysis, approximately equal to 0.577216. It represents the limit of the series 1 + 12 + 13 + 14 + ...1n − (natural logarithm of n), as n tends to infinity. It is not known whether this is a rational number or not

Faraday's constant US English

The quantity of electric charge carried by one mole of electrons (equal to 96.49 coulombs)

Hubble's constant US English

The ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer. The reciprocal of the constant is called Hubble time and represents the length of time for which the universe has been expanding, and hence the age of the universe

Lambert, Constant US English

(1905–51), English composer, conductor, and critic; full name Leonard Constant Lambert. He wrote the music for the ballet Romeo and Juliet (1926) and the jazz work The Rio Grande (1929), later becoming musical director of Sadler’s Wells (1930–47)

Michaelis constant US English

The concentration of a given enzyme that catalyzes the associated reaction at half the maximum rate

Boltzmann's constant US English

The ratio of the gas constant to Avogadro’s number, equal to 1.381 × 10-23 joules per kelvin in the case where the number of molecules is equal to Avogadro’s number

cosmological constant US English

An arbitrary constant in the field equations of general relativity

dielectric constant US English

A quantity measuring the ability of a substance to store electrical energy in an electric field

dissociation constant US English

A quantity expressing the extent to which a particular substance in solution is dissociated into ions, equal to the product of the concentrations of the respective ions divided by the concentration of the undissociated molecule

gravitational constant US English

The constant in Newton’s law of gravitation relating gravity to the masses and separation of particles, equal to 6.67 × 1011N m2 kg2

fine-structure constant US English

A fundamental and dimensionless physical constant, equal to approximately 1137, that occurs in expressions describing the fine structure of atomic spectra

Planck constant in Planck's constant US English

A fundamental constant, equal to the energy of a quantum of electromagnetic radiation divided by its frequency, with a value of 6.626 × 1034 joule-seconds

Avogadro's number US English

The number of atoms or molecules in one mole of a substance, equal to 6.023 × 1023

Avogadro's constant in Avogadro's number US English

The number of atoms or molecules in one mole of a substance, equal to 6.023 × 1023

k in Boltzmann's constant US English

The ratio of the gas constant to Avogadro’s number, equal to 1.381 × 10-23 joules per kelvin in the case where the number of molecules is equal to Avogadro’s number

sedimentation coefficient US English

A quantity related to the size of a microscopic particle, equal to the terminal outward velocity of the particle when centrifuged in a fluid medium divided by the centrifugal force acting on it, expressed in units of time

sedimentation constant in sedimentation coefficient US English

A quantity related to the size of a microscopic particle, equal to the terminal outward velocity of the particle when centrifuged in a fluid medium divided by the centrifugal force acting on it, expressed in units of time

Leonard Constant Lambert in Lambert, Constant US English

(1905–51), English composer, conductor, and critic; full name Leonard Constant Lambert. He wrote the music for the ballet Romeo and Juliet (1926) and the jazz work The Rio Grande (1929), later becoming musical director of Sadler’s Wells (1930–47)

constant US Thesaurus

the constant background noise

constant English-Spanish

constante, continuo

Hubble's constant in Hubble New Oxford Dictionary for Writers & Editors

, Edwin Powell (1889–1953), American astronomer, who proposed Hubble's law and Hubble's constant

I'm in constant pain in pain English-Spanish

siento dolor permanentemente

calculated at constant prices in constant English-Spanish

calculado a precios constantes

expressed in constant dollars in constant English-Spanish

expresado en dólares constantes

the fax is in constant use in constant English-Spanish

el fax se usa continuamente

we must keep a constant vigil in vigil English-Spanish

debemos mantenernos siempre alertas

she broke under constant interrogation in break English-Spanish

no resistió el constante interrogatorio

a period marked by constant riots in mark English-Spanish

un período caracterizado por constantes disturbios

the elevator is in constant use in use English-Spanish

el ascensor se usa constantemente

her constant teasing roused him to fury in rouse English-Spanish

sus constantes burlas lo enfurecieron

his constant willingness to help others in willingness English-Spanish

el hecho de que esté siempre dispuesto a ayudar a los demás

she gets no respite from the constant pain in respite English-Spanish

el dolor no le da tregua, nunca siente alivio del dolor

she needs constant reassurance of your love in reassurance English-Spanish

necesita que constantemente le demuestres tu amor

constant use had worn the soles very thin in wear English-Spanish

las suelas habían quedado muy delgadas con el uso constante


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