Flashcard: Thermodynamics of Pure Substances — 18 carte

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.