the equilibrium constant for a reversible dissociation | dissociation constant; |

(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole | gas constant; r; universal gas constant; |

(physics) the universal constant relating force to mass and distance in Newton's law of gravitation | constant of gravitation; g; gravitational constant; universal gravitational constant; |

(cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today | hubble's constant; hubble's parameter; hubble constant; hubble parameter; |

the charge on an ion is equal to a constant charge e multiplied by an integer from 1 to 15 | ionic charge; |

the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second | h; planck's constant; |

the degree of oxidation of an atom or ion or molecule; for simple atoms or ions the oxidation number is equal to the ionic charge | oxidation number; oxidation state; |

(mathematics) the number of elements in a set or group (considered as a property of that grouping) | cardinality; |

the total number counted | count; |

a complete number or quantity | complement; |

the number of red and white corpuscles in a blood sample | blood count; |

a count of troops killed in an operation or time period | body count; |

number of copies of a newspaper or magazine that are sold | circulation; |

(library science) the count of books that are loaned by a library over a specified period | circulation; |

number of people in a particular group | head count; headcount; |

the number of pollen grains (usually ragweed) in a standard volume of air over a twenty-four hour period and a specified time and place | pollen count; |

the number of sperm in an ejaculate | sperm count; |

any of the numbers (or symbols) that form a product when multiplied together | factor; |

factor by which a quantity that is expressed in one set of units must be multiplied in order to convert it into another set of units | conversion factor; |

the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality | constant of proportionality; factor of proportionality; |