A homogeneous material is a material which has a uniform composition throughout.
What do we mean when we say "uniform composition"?
I have learnt about pure substances in Thermodynamics which have a uniform chemical composition throughout. Air can be assumed as a pure substance because no matter where I take a unit volume, the chemical composition - the percentages of its constituents (nitrogen, oxygen, CO2 etc) will remain same everywhere.
- Does being homogeneous,calling a material homogenous the same as beingcalling it a pure substance?
Furthermore, homogenous materials at every point have same properties in a direction. Modulus of elasticity doesn't have a direction, how this makes sense?
- What is meant by "same properties in a direction"?