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krypton    音标拼音: [kr'ɪptɑn]
n. 氪

氪

krypton
n 1: a colorless element that is one of the six inert gasses;
occurs in trace amounts in air [synonym: {krypton}, {Kr},
{atomic number 36}]

Noble \No"ble\, a. [Compar. {Nobler}; superl. {Noblest}.] [F.
noble, fr. L. nobilis that can be or is known, well known,
famous, highborn, noble, fr. noscere to know. See {know}.]
1. Possessing eminence, elevation, dignity, etc.; above
whatever is low, mean, degrading, or dishonorable;
magnanimous; as, a noble nature or action; a noble heart.
[1913 Webster]

Statues, with winding ivy crowned, belong
To nobler poets for a nobler song. --Dryden.
[1913 Webster]

2. Grand; stately; magnificent; splendid; as, a noble
edifice.
[1913 Webster]

3. Of exalted rank; of or pertaining to the nobility;
distinguished from the masses by birth, station, or title;
highborn; as, noble blood; a noble personage.
[1913 Webster]

Note: Noble is used in the formation of self-explaining
compounds; as, noble-born, noble-hearted, noble-minded.
[1913 Webster]

{Noble gas} (Chem.), a gaseous element belonging to group
VIII of the periodic table of elements, not combining with
other elements under normal reaction conditions;
specifically, {helium}, {neon}, {argon}, {krypton},
{xenon}, or {radon}; also called {inert gas}.

{Noble metals} (Chem.), silver, gold, and platinum; -- so
called from their resistance to oxidation by air and to
dissolution by acids. Copper, mercury, aluminium,
palladium, rhodium, iridium, and osmium are sometimes
included.
[1913 Webster]

Syn: Honorable; worthy; dignified; elevated; exalted;
superior; sublime; great; eminent; illustrious;
renowned; stately; splendid; magnificent; grand;
magnanimous; generous; liberal; free.
[1913 Webster]


Krypton \Kryp"ton\ (kr[i^]p"t[o^]n), n. [NL., fr. Gr. krypto`n,
neut. of krypto`s hidden.] (Chem.)
An inert gaseous element of the argon (noble gas) group, of
atomic number 36, occurring in air to the extent of about one
volume in a million. It was discovered by Ramsay and Travers
in 1898. Boiling point, -152.3[deg] C.; melting point,
-156.6[deg] C.; symbol, Kr; atomic weight, 83.8.
[Webster 1913 Suppl.]

A {frame language}.

["An Essential Hybrid Reasoning System: Knowledge and Symbol
Level Accounts of KRYPTON", R.J. Brachman et al, Proc
IJCAI-85, 1985].

(2011-12-05)


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  • spacex - Why will Starlink satellites use krypton instead of xenon for . . .
    The Starlink satellites, however, will use a different noble gas: krypton It has a lower density, so the satellite fuel tanks need to be larger, and it offers less performance than xenon But krypton can be bought at just one-tenth the cost of xenon, which matters if a company wants to fuel thousands of satellites Price and production rate
  • What performance specification would be lower for Krypton than for . . .
    The Starlink satellites, however, will use a different noble gas: krypton It has a lower density, so the satellite fuel tanks need to be larger, and it offers less performance than xenon But krypton can be bought at just one-tenth the cost of xenon, which matters if a company wants to fuel thousands of satellites (emphasis added)
  • Does Krypton or Xenon produce more thrust in a Hall-effect thruster . . .
    Does this then mean that while Krypton needs more power to operate, it achieves higher specific impulse because the electrons will have higher velocity when ionized? But then why is the overall thrust for Krypton lower? Wouldn't the above mean that for the same flow rate of fuel, at the same discharge voltage, Krypton produces more thrust?
  • physics - Why might krypton have a lower utilization fraction than . . .
    The lower mass of krypton with respect to xenon also decreases the sputtering yield approximately by the square root of the mass ratio If Hall thruster efficiency on krypton can be improved to approach that of xenon, a krypton thruster could benefit several interplanetary missions due to its higher specific impulse and longer lifetime
  • spacex - How much krypton do Starlink satellites carry when they are . . .
    Starlink satellites use krypton as propellant This answer roughly estimates 2 3 kg of Krypton based on a total delta-V of 190 m s and an exhaust velocity of 20,000 m s But how close is that to reality? Is it known how much propellant is loaded into a Starlink satellite at launch?
  • How much krypton is stored on a Starlink satellite?
    How much krypton (fuel) is there for the krypton-powered ion thrusters on Starlink satellites and how long does it last?
  • How much does it cost to fill an ion thuster with Xenon for a . . .
    The Starlink constellation v1 satellites used Krypton for its ion thrusters Starlink v2 satellites use Argon Alibaba shows Krypton at around ~$100 cubic meter, which is less than a tenth of the of the price volume wise And Argon costs far less than Krypton
  • ion thruster - Have light gases like hydrogen or helium been explored . . .
    (Top edit: The Question asserts "Xenon and krypton are popular despite their heavy mass" and asks about exploring H or He ion propellants for improved Isp This answer shows that lighter is not better for ion thrusters, because Isp is not the proper measure of a power-limited situation
  • Who built Starlinks electric propulsion systems?
    The krypton engine used in starlink satellites could have been developed in Poland at the Institute of Plasma Physics and Laser Mixing It is important that the working factor is krypton, which is many times cheaper than xenon
  • Why do ion thrusters frequently use xenon as the reaction mass?
    From skimming the Wikipedia article on ion thrusters, I notice that xenon is frequently (though not exclusively) used as the reaction mass in systems that have actually been deployed - Deep Space 1,





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