Pure substance — definition?
Homogeneous, invariable composition in all phases.
Phases of pure substances?
Compressed liquid, saturated liquid, saturated vapor, superheated vapor.
Saturation temperature — role?
Temperature at which boiling begins at a given pressure.
Critical point — significance?
Phase boundary disappears; liquid and vapor become indistinguishable.
Quality — meaning?
Vapor mass fraction in a saturated mixture.
Thermodynamic tables — main properties?
Enthalpy and entropy.
Phase state — determined by?
Pressure, temperature, and critical properties.
Water tables — used for?
Finding properties and phases of water.
Rigid container — key calculation?
Volume = mass × specific volume.
Pure substance — characteristics?
Homogeneous, can be element, compound, or homogeneous mixture.
Saturated vapor — condition?
At the verge of condensation at given P and T.
Saturation curve — depicts?
Pressure vs temperature at phase change.
Triple point — defines?
Solid, liquid, vapor coexistence.
Superheated vapor — condition?
Above saturation temperature at constant pressure.
Quality and humidity — relation?
x + y = 1; phase proportions.
Enthalpy — formula?
h = u + Pv.
Phase identification — method?
Compare P, T to saturation and critical data.
Water property tables — purpose?
Determine properties at various states.
Pon a prueba tus conocimientos con 9 preguntas sobre Thermodynamics of Pure Substances.
1. Why is a mixture like oil and water not considered a pure substance?
2. If a liquid is held at a pressure where its temperature is lower than the saturation temperature, how should this phase be classified?
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