Density (disambiguation) — Density and dense usually refer to a measure of how much of some entity is within a fixed amount of space. Types of density include: In physics, density of mass: Density, mass per volume Area density or surface density, mass over a (two… … Wikipedia
Planck (disambiguation) — Max Planck was one of the most important German physicists of the late 19th and early 20th century, and is considered to be the founder of quantum theory.Planck may also refer to: * Planck s law of black body radiation * Planck s constant *… … Wikipedia
Planck constant — Planck s relation redirects here. For the law governing black body radiation, see Planck s law. Values of h Units 6.62606957(29)×10−34 J·s[1] 4.135 … Wikipedia
Planck units — are units of measurement named after the German physicist Max Planck, who first proposed them in 1899. They are an example of natural units, i.e. units of measurement designed so that certain fundamental physical constants are normalized to 1. In … Wikipedia
Max Planck — Planck redirects here. For other uses, see Planck (disambiguation). Max Planck Born April 23, 1858( … Wikipedia
Planck epoch — In physical cosmology, the Planck epoch (or Planck era), named after Max Planck, is the earliest period of time in the history of the universe, from zero to approximately 10 43 seconds (one Planck time), during which quantum effects of gravity… … Wikipedia
planck radiation law — noun Usage: usually capitalized P Etymology: after Max K. E. L. Planck 1. : a law in physics: radiant energy arising from processes within atoms or molecules is emitted in finite quanta each of which is equal to the product of the radiation… … Useful english dictionary
Density matrix — Mixed state redirects here. For the psychiatric condition, see Mixed state (psychiatry). In quantum mechanics, a density matrix is a self adjoint (or Hermitian) positive semidefinite matrix (possibly infinite dimensional) of trace one, that… … Wikipedia
Planck — /plahngk/, n. Max Karl Ernst /mahks kahrddl erddnst/, 1858 1947, German physicist: Nobel prize 1918. * * * ▪ European Space Agency satellite a European Space Agency satellite, to be launched in 2009, designed to measure the cosmic microwave … Universalium
Orders of magnitude (density) — Skylab measured several orders of magnitude of the Sun s density (top scale: 10−18 to 10−6 g⋅cm−3, equivalent to 10−15 to 10−3 kg⋅m−3) at different temperatures and heights above its surface. List of orders of magnitude for density less than … Wikipedia
