ISO 7504:2015 pdf free
ISO 7504:2015 pdf free.Gas analysis一Vocabulary
pressure and temperature condition at which the liquid phase is in equilibrium with the first appearing bubbles of gas
Note 1 to entry: For pure substances, dew point (4.6) and bubble point coincide. At that temperature, the pressure equals the saturation vapour pressure (4.5).
single point in pressure-temperature space at which the composition (3.5) and properties of the gas and liquid phases in equilibrium are identical
Note 1 to entry: The pressure at this point is known as the “critical pressure Pc” and the temperature as the “critical temperature Tc”, respectively.
Note 2 to entry: For a pure substance, the critical temperature is that temperature above which only the gas phase can exist irrespective of the applied pressure.
maximum pressure at which two-phase separation (condensation) can occur
Note 1 to entry: The phase coordinates cricondenbar and cricondentherm (4.10) apply to gas mixtures (with the binary system as the simplest case). For a gas mixture, the critical point (4.8) is no longer the maximum pressure, as well as the maximum temperature for vapour-liquid coexistence (see Figure 1).
Note 2 to entry: It is the highest pressure in the two-phase envelope and generally higher than the critical pressure.
Note 3 to entry: For a pure substance, cricondentherm (4.10), cricondenbar, and critical point (4.8) are represented by a single point, i.e. the critical point.
maximum temperature at which two-phase separation (condensation) can occur
Note 1 to entry: The phase coordinates cricondenbar (4.9) and cricondentherm apply to gas mixtures (with the binary system as the simplest case). For a gas mixture, the critical point (4.8) is no longer the maximum pressure, as well as the maximum temperature for vapour-liquid coexistence (see Figure 1).
Note 2 to entry: It is the highest temperature in the two-phase envelope and generally higher than the critical temperature.
Note 3 to entry: For a pure substance, cricondentherm, cricondenbar (4.9), and critical point (4.8) are represented by a single point, i.e. the critical point.ISO 7504 pdf download.
