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1) In Aristotelian physics, the fifth element, of which the stars and planets are made.

2) In Classical physics, an invisible medium that was thought to suffuse all space.

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Szófaj: noun
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Ipar/Tárgykör: Astronomy
Kategória: General astronomy
Company: Caltech
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Chemistry; General chemistry

An ester is a compound formed from an acid and an alcohol . In esters of carboxylic acids , the -COOH group and the -OH group lose a water and become a -COO- linkage: R-COOH + ...

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Beverages; Beer

Volatile flavor compounds naturally created during fermentation that add fruity, flowery and/or spicy flavors to beer.

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Chemistry; Organic chemistry

The compound formed by the elimination of water and the bonding of an alcohol and an organic acid.

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Chemistry; Organic chemistry

RCOOR_ A fatty acid in which the alkyl group (R_) of a monohydric alcohol replaces the active hydrogen; for example, RCOOCH 3 from reaction of RCOOH with methane.

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Chemistry; Organic chemistry

A compound containing two ester groupings.

А тобы

Astronomy; General astronomy

One of about a dozen of the strongest Fraunhofer lines seen in the Solar spectrum, the A band at 7600 angstoms is due to telluric lines of molecular oxygen in the Earth's ...

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Astronomy; General astronomy

Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are ...

Ахиллес

Astronomy; General astronomy

Trojan asteroid (60° ahead of Jupiter. It was the first Trojan to be discovered.

атомдық нөмір (заряд нөмірі)

Astronomy; General astronomy

The number of protons in an atom's nucleus. This determines the type of element.

поляр шұғыласы

Astronomy; General astronomy

the light produced by excited atoms and ions in the upper atmosphere of a planet

азимут

Astronomy; General astronomy

1) Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith. 2) Directional ...