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 (P
m
+ a) = b lg T
m
+ c
with :
P
m
and T
m
:
melting pressure and temperature
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