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Triple point
In
thermodynamics
, the
triple point
of a substance is the
temperature
and
pressure
at which the three
phases
(
gas
,
liquid
, and
solid
) of that substance coexist in
thermodynamic equilibrium
. For example, the triple point of
mercury
occurs at a temperature of -38.83440 °C and a pressure of 0.2
m
Pa
.
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