#factor_of_proportionality__constant_of_proportionality  the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality
  supertype:  factor.number  constant
  subtype:  Planck's_constant__h  the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10\-34 joule-second

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