S: (n) rheology (the branch of physics that studies the deformation and flow of matter)
S: (n) solid-state physics (the branch of physics that studies the properties of materials in the solid state: electrical conduction in crystals of semiconductors and metals; superconductivity; photoconductivity)
S: (n) statistical mechanics (the branch of physics that makes theoretical predictions about the behavior of macroscopic systems on the basis of statistical laws governing its component particles)
S: (n) thermodynamics (the branch of physics concerned with the conversion of different forms of energy)