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universal constant

subject fact

universal constant is a kind of fundamental physical constant 2001-09-27 09:32:59.0

fundamental physical constant has value changes in value are due solely to an increase in measurement accuracy or convention
has accuracy
has unit

Kinds of universal constant :

characteristic impedance of vacuum (6 facts) (Z₀)
electric constant (4 facts) (ε₀)
Gaussian gravitational constant (4 facts) (k) - The constant defining the astronomical system of units of length (astronomical unit), mass (solar mass) and time (day), by means of Kepler's third law. The dimensions of k² are those of Newton's constant of gravitation: L³M^-1T^-2.
magnetic constant (4 facts) (μ₀)
Newtonian constant of gravitation (8 facts) (G) - The universal constant of proportionality in the attraction between two unit masses a unit distance apart.
Planck constant (7 facts) (h) - The universal constant of proportionality relating the frequency of a photon to its quantum of energy., Planck's constant is a fundamental parameter in quantum mechanics. It determines the size of the discrete units of energy, mass, spin, etc. into which the microscopic world is partitioned., A universal constant of nature that measures the magnitude of quantum mechanical effects.
Planck length (9 facts) (l_P) - The dimension at which space is predicted to become "foamlike" and at which Einstein's theory is supposed to break down., The size limit at which normal notions of space-time are supposed to break down., The scale below which quantum fluctuations in the fabric of spacetime would become enormous. The size of a typical string in string theory.
Planck mass (7 facts) (m_P) - About ten billion billion times the mass of a proton; about one-hundredth of a thousandth of a gram; about the mass of a small grain of dust. The typical mass equivalent of a vibrating string in string theory.
Planck time (6 facts) (t_P)
speed of light in vacuum (4 facts) (c)

universal constant	is a kind of fundamental physical constant
fundamental physical constant	has value changes in value are due solely to an increase in measurement accuracy or convention
	has accuracy
	has unit