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constant British & World English

Occurring continuously over a period of time

rate constant British & World 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 British & World English

A time which 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 British & World English

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

solar constant British & World English

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

Planck's constant British & World 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 joules

Rydberg constant British & World English

A constant, 1.097 x 107 m−1, which 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 British & World English

A constant representing the strength of the interaction between a particle and a field

Euler's constant British & World English

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

Faraday's constant British & World English

The quantity of electric charge carried by one mole of electrons (equal to roughly 96,490 coulombs)

Hubble's constant British & World 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 British & World 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 British & World English

The concentration of a given substrate which catalyses the associated reaction at half the maximum rate

Avogadro's constant British & World English

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

Boltzmann's constant British & World English

The ratio of the gas constant to Avogadro’s constant, 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 British & World English

An arbitrary constant in the field equations of general relativity

dielectric constant British & World English

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

dissociation constant British & World 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 British & World English

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

fine-structure constant British & World English

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

Planck constant in Planck's constant British & World 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 joules

k in Boltzmann's constant British & World English

The ratio of the gas constant to Avogadro’s constant, 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 British & World 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 British & World 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 British & World 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 English Thesaurus

the constant background noise of the city

constant English-Spanish

constante, continuo

constant in ceaseless English Thesaurus

they kept up a ceaseless flow of questions

constant in constant English Thesaurus

the constant background noise of the city

constant in continual English Thesaurus

the service has been disrupted by continual breakdowns

constant in continuous English Thesaurus

for the past few days there had been continuous rain

constant in faithful English Thesaurus

she stayed faithful all her married life

constant in loyal English Thesaurus

she was loyal to her country

constant in true English Thesaurus

it may seem hard to believe, but I can assure you it's true

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


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