- 2075 Baisakh · 4 marks
Define moisture content, superheated vapor, etc.
Short answer
Moisture content is mass fraction of liquid, 1−x. Superheated vapor exists above saturation temperature. Saturation pressure is pressure where phase change occurs at a given temperature. Saturated liquid is at saturation state with x=0.
Define the terms moisture content, superheated vapor, saturation pressure and saturated liquid.
- Moisture content: the mass fraction of liquid in a liquid-vapour mixture, = m_liquid / m_total = 1 − x, where x is the quality (dryness fraction).
- Superheated vapour: vapour at a temperature higher than the saturation temperature corresponding to its pressure (or at a pressure lower than the saturation pressure at its temperature). It is a single-phase gas-like state; T and P are independent. Degree of superheat = T − T_sat.
- Saturation pressure: the pressure at which a pure substance changes phase (boils or condenses) at a given temperature. For water at 100 °C it is 101.3 kPa.
- Saturated liquid: a liquid at the saturation temperature and pressure; any addition of heat will cause some of it to vaporise (x = 0).
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