Description of saturation curves and boiling process of dry air
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciences
Abstract
Air is a mixture of gases forming the gas wrap of Earth. It is formed by dry air, moisture and
other pollutants. Dry air is a substance whose thermodynamic properties in gaseous state, as well as the
thermodynamic properties of its main constituents in gaseous state, are generally known and described in
detail in the literature. The liquid air is a bluish liquid and is industrially used to produce oxygen, nitrogen,
argon and helium by distillation. The transition between the gaseous and liquid state (the condensation
process, resp. boiling process), is usually displayed in the basic thermodynamic diagrams using the
saturation curves. The saturation curves of all pure substances are of a similar shape. However, since the dry
air is a mixture, the shapes of its saturation curves are modified relative to the shapes corresponding to the
pure substances. This paper deals with the description of the dry air saturation curves as a mixture, i.e. with
a description of the process of phase change of dry air (boiling process). The dry air saturation curves are
constructed in the basic thermodynamic charts based on the values obtained from the literature. On the basis
of diagrams, data appearing in various publications are interpreted and put into context with boiling process
of dry air.
Description
Subject(s)
dry air, mixture, saturation curve
Citation
ISSN
2100-014X