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kliuless (3)
The official
SI definition of a kilogram is "equal to the mass of the international prototype," a cylinder of nine-tenths platinum and one-tenth iridium, forged in the 1880s. "Le Grand K," as the prototype is affectionately known, is the basis not only for the measurement of mass and volume, but of
force,
energy, and
luminosity—and since the 1940s, Le Grand K has been losing weight. Now scientists are trying to
redefine the kilogram in terms of fundamental constants—and in doing so, perhaps fulfill the 18th-century promise of a universal, fundamental system of measurement "for all people, for all time."
posted by Zozo
on Oct 4, 2011 -
58 comments
Redefining Avogadro's Number. A mole is the number of molecules in a gram of water: ~6.022 x 10
23. Unfortunately "a gram" is defined by
a chunk of metal in
a vault in France, the last of the seven SI units still defined by a physical artifact. Since the reference mass (known as "Le Gran K") is actually
changing over time (due to cleaning, handling, etc), the definition of a gram is currently temporally unstable.
Now a new proposal has been put forward to explicitly define the number to be a known integer: 602,214,141,070,409,084,099,072, which would fundamentally change the way we define a gram. Le Gran K could become a historical curiosity like
the original platinum meter stick.
posted by dkg
on Mar 2, 2007 -
39 comments
The LoTR musical needs Hobbits of a certain stature. What stature is that, budding thespians might ask? Well,
smoot-height, of course! (Actually, 5'7" — or 170 cm — is the maximum height a would-be Frodo or Bilbo could be.) Another requirement is the ability to sing two songs ... and hairy appendages wouldn't hurt. So start knitting those foot-
merkins! Auditions: 18 September, Theatre Royal Drury Lane, Catherine St (tube stop: Covent Garden).
posted by rob511
on Sep 12, 2006 -
25 comments
Do Penis Enlargement Pills Work? I'll be chronicling my experience here for the benefit of others. I'll add that I am just a regular guy living in New York City (Go Yankees!) who wants a larger penis.
(via Kill Ugly Radio). I'll be curious to hear how this progresses. This is safe for work (no pics; just measurements).
posted by KevinSkomsvold
on Aug 12, 2003 -
41 comments
Metric Time... it's 95.5 do you know where your children are? (Check out the whole site; it's a wonderful melange of crazy and not so crazy ideas.)
posted by silusGROK
on May 29, 2001 -
14 comments
Gee, stupid me. I thought it was a pretty good statue, myself. Seems someone with a laser beam and time on his hands has worked out that the statue of David squints. Wow. Thanks a lot, mister! I can rest a lot easier knowing
that. Why, I might have been misled into believing it was some kind of masterpiece or something.
What, he couldn't find anything
more useless to do with his sabbatical?
posted by Ezrael
on Jun 9, 2000 -
11 comments