unary diagram, unary phase diagram, pressure-temperature phase diagram, pressure-temperature equilibrium phase diagram, pressure-temperature diagram, P-T diagram, P-T-diagram, P-T phase diagram, PT diagram, one-component phase diagram
materjali stabiilseid olekuid (tahke, vedel, gaasiline) iseloomustav kahedimensiooniline rõhk-temperatuur diagramm ühekomponentses süsteemis (vt faasidiagramm; vrd kahekomponentne faasidiagramm, kolmekomponentne faasidiagramm), a plot of the phase changes of one element (component) as a function of temperature and pressure (see: phase diagram; compare: binary phase diagram, ternary phase diagram)
