<{p}>The lower part of the arched curve of the pure matter T-S diagram is called the<{span style="font-size: 1em;"}>(Gas phase zone, liquid phase zone, vapor-liquid coexistence zone)<{/span}><{span style="font-size: 1em;"}>纯物质T-S图的拱形曲线下部称为<{/span}><{span style="font-size: 1em;"}>(气相区、液相区、汽液共存区)<{/span}><{/p}>