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Old 12-04-2010, 09:58 PM
Squink Squink is offline
Join Date: Oct 2000
Location: Yes
Posts: 20,327
Where does the mass of a kilogram come from?

the International Bureau of Weights and Measures (BIPM) outside Paris
in the basement of the BIPM's main lab building, which houses a vault secured with three locks. Three antique keys, held by citizens of different countries, open these locks.
the three key holders produce the keys, open the vault, unlock a safe inside the vault and inspect its principal contents: the platinum–iridium cylinder that defines the kilogram.
Au revoir, kilogram (with a nice picture of the kilogram inside its three nested bell jars).

So In Paris:In a Basement:In a Vault:In a Safe:Inside 3 bell jars.