Density of Elemental Mercury (Solid)
Name: Alice C.
Liquid mercury has a density of about 13.55 g/cc at room
temperature. What is its density as a solid at about -40 C?
I was able to find a single number or 15.6 gm/ml. However, I was not able
to find the source of the data. Since I cannot find the source, this
number is only approximate.
God help us all; I cannot understand why the solid Mercury's density is
still a blank in all the publicly available sources.
it says: "Density of solid [/kg m-3]: no data",
but on the next line: "Molar volume [/cm3]: 14.09"
and at the top is the molar mass: "80 / Hg / 200.59(2)"
From these the theoretical density of frozen mercury is implicitly defined:
(200.59 gm/mol) / (14.09 cm3/mol) = 14.24 gm/cm3
I suppose "density" data means somebody actually measured a real lump.
The molar volume is presumably calculated from the crystal lattice
dimensions on neighboring page:
and so is a slightly abstract ideal. Real crystals may usually have voids
ranging from millimeter bubbles to single-atom vacancies or crystal
defects losing one atom in a group of tens,
and so have very slightly lower density.
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Update: June 2012