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Thermo cht 3
| Term | Definition |
|---|---|
| Simple Compressible Substance | a substance whose magnetic effects and electrical effects are insignificant but changes in volume are very important For example water or a uniform mixture of non-reacting gases). |
| Simple Compressible System | a system consisting of a simple compressible substance |
| State Principle | The state of a simple compressible system at equilibrium can be uniquely determined by two independent intensive thermodynamic properties |
| Single-phase regions | solid, liquid, vapor |
| Two-phase regions | liquid-vapor (vaporization & liquefaction) solid-liquid (melting & freezing) solid-vapor (sublimation: gasification and solidification) |
| vaporization & liquefaction | liquid-vapor |
| melting & freezing | solid-liquid |
| sublimation: gasification and solidification | solid-vapor |
| Triple line | the line along which three phases can exist in equilibrium |
| Critical point | the point for the maximum temperature and pressure at which liquid and vapor phases can coexist in equilibrium. |
| Triple point | a point of the triple line projected onto the phase diagram |
| isotherms | constant-temperature lines drawn in p -v diagram |
| isobars | Note the constant-pressure lines |
| Saturation temperature | the temperature at which a phase change takes place at a fixed pressure |
| Saturation pressure | the pressure at which a phase change takes place at a fixed temperature |
| Subcooled liquid (compressed liquid) | the liquid of which temperature is lower than the saturation temperature |
| Saturated liquid | a substance that exists as liquid at the saturation condition |
| Quality (x) | the ratio of the mass of vapor present to the total mass of the liquid-vapor mixture - an intensive property |
| Saturated vapor | a substance that exists as vapor at the saturation condition |
| dry saturated vapor | quality is 1. |
| Superheated vapor | a vapor of which temperature is higher than the saturation temperature |
| supercritical fluid | If the pressure is equal to or higher than pc |
| Specific Heats | → intensive properties; also called heat capacities) |
| thermally perfect | When u and h of a gas are functions of temperature only |
| calorically perfect | when Cv and Cp are constant monatomic gases or other gases with small temperature change |
| isobaric process | p = constant |
| isometric process | Volume is constant |
Created by:
thermosucks
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