Jet (redirected from jet black)

Jet

(Joint Engine Technology) The database engine used in Microsoft Access and that accompanies Visual Basic and C++. Jet is typically used for storing data in the client machine. Developers using Access and Visual Basic access Jet via the DAO/Jet interface, which is a COM object. See DAO.

---

jet¹

1. a jet-propelled aircraft

2. Astronomy a long thin feature extending from an active galaxy and usually observed at radio wavelengths

---

jet²

a. a hard black variety of coal that takes a brilliant polish and is used for jewellery, ornaments, etc.

b. (as modifier): jet earrings

---

jet [jet]

(astronomy)

A narrow, elongated feature in the radio or optical map of an active galaxy, quasar, or object in the Milky Way Galaxy, believed to represent an energetic outflow of gas from a compact astronomical object.

(fluid mechanics)

A strong, well-defined stream of compressible fluid, either gas or liquid, issuing from an orifice or nozzle or moving in a contracted duct.

(particle physics)

A group of particles issuing in approximately the same direction from a high-energy collision of elementary particles, believed to consist of decay products of a member of a quark-antiquark pair created in the collision.

---

Jet 

a variety of pit coal; it is tough and has a deep black color, a strong, dull luster, and a flinty fracture. Its hardness on the mineralogical scale is 3-3.5; its density is approximately 1,300-1,400 kg/m³.

The formation of jet is associated with the metamorphism of wood buried in marine silts of Mesozoic and Cenozoic deposits. It is found in the form of separate aggregates or pieces in sandstones and marls, as well as in layers of weakly metamorphosed bituminous coal and lignite. Jet is easily worked and takes on a handsome luster when polished; because of this quality it is widely used (especially in the countries of the East) for small articles of jewelry, beads, and rosary beads.

---

Jet 

a calibrated opening used to meter the supply of liquid fuel or air. In the technical literature the term “jet” is used to designate carburetor parts with calibrated openings (plugs or injectors). According to their operational functions and the type of carburetor in which they are installed, jets may be classified as fuel jets, air jets, main jets, compensating jets, or idling jets. Jets are rated by their transmissive capacity—that is, the quantity of a liquid (usually water) that can pass through the calibrated opening per unit time. The transmissive capacity of jets is measured in cm³/min.