Solid, liquid and gas phases
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A pure substance can be in one or more of the three solid, liquid or gas phases
When a solid is heated at a well-chosen constant pressure, it turns into a
fusion
latent heat
liquid
pressure
vapor
vaporization
, and we speak of
fusion
latent heat
liquid
pressure
vapor
vaporization
.
If we continue to add heat, the liquid turns into
fusion
latent heat
liquid
pressure
vapor
vaporization
, and we speak of
fusion
latent heat
liquid
pressure
vapor
vaporization
.
The temperature at which these transformations take place depends on the
fusion
latent heat
liquid
pressure
vapor
vaporization
exerted on the body considered.
In order for each of these phase changes to occur, it is necessary to supply or withdraw energy, called the
fusion
latent heat
liquid
pressure
vapor
vaporization
of state change.
During the change of state, significant variations in specific volume are observed, except for fusion-solidification.
This is particularly the case during vaporization, the
fusion
latent heat
liquid
pressure
vapor
vaporization
being of the order of 600 to 1000 times less dense than the
fusion
latent heat
liquid
pressure
vapor
vaporization
. This specific volume change occurs at constant pressure and temperature.
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