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• Density 21.5 — is a piece of music for solo flute written by Edgard Varèse in 1936 and revised in 1946. The piece was composed at the request of Georges Barrère for the premiere of his platinum flute, the density of platinum being close to 21.5 grammes per… …   Wikipedia

• density current — Geol., Oceanog. See turbidity current. * * * Any current in either a liquid or a gas that is kept in motion by the force of gravity acting on small differences in density. A density difference can exist between two fluids or between different… …   Universalium

• 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

• Density changes with depth (seawater 35 parts per thousand and 0 C) — ▪ Table Density changes with depth (seawater 35 parts per thousand and 0 °C) depth (m) pressure (decibars) density (g/cm3) 0 0 1.02813 1,000 1,000 1.03285 2,000 2,000 1.03747 4,000 4,000 1.04640 6,000 6,000 1.05495 8,000 8,000 1.06315 10,000… …   Universalium

• Spectral density — In statistical signal processing and physics, the spectral density, power spectral density (PSD), or energy spectral density (ESD), is a positive real function of a frequency variable associated with a stationary stochastic process, or a… …   Wikipedia

• Memory storage density — is a measure of the quantity of information bits that can be stored on a given length of track, area of surface, or in a given volume of a computer storage medium. Generally, higher density is more desirable, for it allows greater volumes of data …   Wikipedia

• Computer storage density — is a measure of the quantity of information bits that can be stored on a given length of track, area of surface, or in a given volume of a computer storage medium. Generally, higher density is more desirable, for it allows greater volumes of data …   Wikipedia

• Low-density polyethylene — LDPE has SPI resin ID code 4 Low density polyethylene (LDPE) is a thermoplastic made from petroleum. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical… …   Wikipedia

• Medium-density housing — A new medium density development, having just been built in the United Kingdom. Typical features are the apartments in a multi storey (but not high rise) building. Medium density housing is a term used in Australia to describe residential… …   Wikipedia

• Paper density — The paper density of a type of paper or cardboard is the mass of the product per unit of area. Two ways of expressing paper density are commonly used: * Expressed in grams per square metre (g/m²), paper density is also known as… …   Wikipedia

• Difference density map — In protein crystallography, a difference density map shows the spatial distribution of the difference between the measured electron density of the crystal and the electron density explained by the current model. Conventionally, they are displayed …   Wikipedia