# ideal gas constant

Chegg.com » Answer to For a Carnot cycle, prove that Qh/Th = Qc/Tc using the fol…. Chegg.com

4.6: The Carnot Cycle » The Carnot cycle is the most efficient engine for a reversible cycle designed between two reservoirs. The Carnot principle is another way of stating the second law of thermodynamics. Phys.libretexts.org

Reformulation of expressions for thermoelastic properties of crystals using harmonic mapping » We introduce alternative statistical mechanics expressions for thermoelastic properties of monatomic crystals, in the classical canonical ensemble, using the mapped-averaging framework. Two reference models are examined as a basis for the coordinate mapping: ideal gas (IG) and quasiharmonic (QH) crystal. The former prescribes affine mapping and yields the conventional expressions for the properties, while the latter has, in addition, a nonaffine component and yields alternative formulas, denoted as ``harmonically mapped averaging'' (HMA). While the (strain-dependent) affine mapping is universal and does not require system-specific information, the HMA method uses a system- (and strain-) dependent matrix to specify the mapping; this mapping matrix is derived from the force-constant matrix of the QH reference and its variation with strains. In practice, implementing HMA (and affine) schemes depends on the availability of analytical (Lagrangian) derivatives of potential energy with respect to strains (e.g., Born Journals.aps.org

Efficiency of an ideal-gas cycle. » Homework Statement A possible ideal-gas cycle operates as follows: (i) from an initial state (p1,V1) the gas is cooled at constant pressure to (p1,V2); (ii) the gas is heated at constant volume to (p2,V2); (iii) the gas expands adiabatically back to (p1,V1). Assuming constant heat… Physicsforums.com