Density, I suppose being an absolute.
Ok down the rabbit hole we go
Mass Density or Density is the property of a material that is the
mass of a homogenous volume of that material. It is typically
expressed in mass per unit volume like grams per cubic centimeter.
It it does change with temperature and pressure so it is reported at
a standard temperature and pressure 273.15 K (0.00 C) and 100 kPa
(0.987 atm). But such changes are not a permanent change, it will
return to its standard density at 273.15 K (0.00 C) and 100 kPa
So you distinguish between the density of the underlying material
and that of the finish object. Would the term be Relative density
or specific weight or specific gravity
Specific gravity is another expression for density as a multiple of
the weight of the same volume of water or air.
What is the proper term to be applied here? So I have two blocks
of swish cheese. one as cut from the wheel and the other cut from
the wheel, dropped on the floor and stepped upon.
You could try to differentiate between volumetric density and mass
density but often people will use volumetric density to refer to
mass density. To really confuse things there is a term called bulk
density that is used to define mass/volume of a powder or granular
You say both are of the same density..... Both weigh the same. one
takes up less space.
That is the point of the homogenous term in the definition of
HIP precesses are used to densify casting. it is one of the major
So a little loose in terminology, it does heal internal voids but
will not fix any porosity that has a path to the surface so it only
fixes isolated voids
Of course if we could get the porosity to all form on the outside
of the casting things would be different.
It is possible for two wrought products to be different as
one could have gas absorbed into interstitial spaces and be thus
heavier. embrittled perhaps, but. no larger in volume.
Oxides or nitrides would have a lower density than the metal and of
course now aren’t homogenous.
one could have micro cracks one could have lattice displacements.
i. e. dislocations.
So you raise good points that show how complex this could get but
the point I was trying to make is die striking will not change the
mass density of the metal, that is a property of the metal itself.
James Binnion Metal Arts