The first step is to find out how the liquid-solid transition evolves under high pressure. With the exception of a few well-known substances (water, some salts, bismuth, antimony...), the melting temperature of a solid increases with pressure. The empirical relationship :lg (Pm + a) = b lg Tm + c
with :
Pm and Tm
:
melting pressure and temperature
a, b and c
:
adjustable constants,
was proposed by Simon
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