. Applied thermodynamics for engineers. A,C, O ^ B Fig. 11. Art. 82. — Fig. 12. Art. Perspective Dia- TF Diagram,gram. o*- AB. , C Fig. 13. Art. 82.—VP Diagram. Fig. 14. Art. Diagram. 83. Thermal Lines. In Fig. 15, let a substance, originally at A, passat constant pressure and temperature to the state B; thence at constanttemperature and volume to the state C; and thence at constant pressure. A8. CxP, B,C, Fig. 15. Art. 83.— Fig. 16. Art. 83. — Fig. 17. Art. 83. — Fig. 18. Art. 83. Perspective Ther- TP Path. VP Path. TV Path. mal Line. and volume to D. Its changes are represented
. Applied thermodynamics for engineers. A,C, O ^ B Fig. 11. Art. 82. — Fig. 12. Art. Perspective Dia- TF Diagram,gram. o*- AB. , C Fig. 13. Art. 82.—VP Diagram. Fig. 14. Art. Diagram. 83. Thermal Lines. In Fig. 15, let a substance, originally at A, passat constant pressure and temperature to the state B; thence at constanttemperature and volume to the state C; and thence at constant pressure. A8. CxP, B,C, Fig. 15. Art. 83.— Fig. 16. Art. 83. — Fig. 17. Art. 83. — Fig. 18. Art. 83. Perspective Ther- TP Path. VP Path. TV Path. mal Line. and volume to D. Its changes are represented by the broken line ABCD,which is shown in its various projections in Figs. 16-18. The thermalline of the coordinate diagrams, Figs. 11 and 15, is the locus of a series ofsuccessive states of the substance. A path is the projection of a thermalline on one of the coordinate planes (Figs. 12-14, 16-18). The path of asubstance is sometimes called its process curve, and its thermal line, athermogram. The following thermal lines are more or less commonly studied: — (a) Isothermal, in which the temperature is constant; its plane is perpendicular to the OT axis. (b) Isometric, in which the volume is constant; having its plane per- pendicular to the 01^ axis. ((?) Isopiestic, in which the pressure is constant; its plane being per-pendicular to the OF axis. (c?) Isodynamic, that along which no chang
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