Its a very uniform mixture of reactants. It is kept isothermal. The question comes down to continuum mechanics. Even though we can assume the material to be isotropic, due to the requirement of the disc being continuus, the geometry of the system is not. If the restraint of continuity...
The reaction is exothermal, but the disc is kept isothermal. And the material is isotropic. The reaction takes days. It's the geometry that puzzles me. The problem is then a disc that is subjected to constant forces in the radial direction that also has a time changing density. (The internal...
Actually its a chemical reaction where the product are denser than the reactants. And the size of my disk is about a cm in diameter and a few mm in height. We can detect size differences down to a couple nm.
This is not a homework question! I am observing that a thin, flat disk made from a material whose density is gradually increasing, shrinks in the radial direction (of course) but appears to grow very slightly in the z-direction. The change in density is supposed to be isotropic.
Is growth...