There are several lines, depending on the result
you desire. For example, if the object is
separation, then a mixture in which some
components settle to the top or bottom of the
container is clearly heterogeneous. Another
interpretation is the examination scale Concrete
is clearly heterogeneous (rocks are quite
distinguishable), yet in large quantities, the
physical properties approach a homogenous model --
ie.viscosity becomes uniform when averaged over
large enough scale.
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