[MUD-Dev] Material state transformations

[McDonald]

Yuri Bashukov asked:

> I'm looking for characteristics of different states of material,
> or at least some of them, which are "most known", or "visual" to
> people.

Are you really sure you want this?  Here are just a fraction of the
characteristics that you could record:

  For all phases (different for each phase!):
    color
    transparency
    heat capacity

  For solids:
    solubility (in relation to each different liquid!)
    tensile and compressional strengths
    elasticity
    density (slightly dependant on temperature)
    porosity
    crystalline state (ordered or unordered)

  For liquids:
    miscibility (in relation to each other liquid!)
    density (slightly dependant on temperature)
    acidity
    viscosity

  For gases:
    molecular weight (if you are going to program the ideal gas law
      to determine pressure, volume, and density from temperature)
      acidity viscosity

There are actually hundreds of other properties that you could
record, though many may not be important (e.g. refractivity, vapor
pressure).  But some may be important for some things you want to do
(e.g. magnetic properties).

Even the simple things listed above are rather complex.  The melting
and boiling points of every material depends on the pressure, and
varies differently from material to material.  If you are going to
allow different pressures, you will have to program in a
temperature-pressure phase diagram for each material.  And some
materials have multiple solid or liquid phases (water has 7 solid
phases, each with different densities and mechanical properties!)
Many other properties, such as elasticity and viscosity, are
temperature dependant.

Then there are mixtures of materials.  Rocks are a good example.
Many ores can be heated, producing molten metal and leaving behind
the non-metallic slag.  So different parts of the mixture can have
different melting points.

This is rather complex model to produce, and it is probably not
worthwhile.  But if you are really interested in these and many
other physical properties, then the place to look is the CRC
Handbook of Physics and Chemistry, and similar handbooks, which
should be available at any library.

					-----steve m
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