Gasanteil

Gasanteil is a term used to describe the share of a particular gas within a mixture, a system containing gas, or a pore space that can hold gas. It is typically expressed as a volume fraction (vol%), a molar fraction (x_i), or, in some contexts, as a mass fraction. In gas mixtures, the gasanteil of component i is the fraction of moles or volume it contributes to the total mixture and is related to partial pressure by P_i = y_i P_total (Dalton’s law).

Contexts and meanings:

- Gas mixtures: In air or technical gases, the gasanteil indicates how much of the total volume is occupied by each gas, for example roughly 21 vol% oxygen in dry air.

- Dissolved or trapped gases: In liquids, the gasanteil can describe the amount of gas dissolved under given conditions, often linked to Henry’s law and expressed as volume of gas per volume of solvent.

- Porous media and rocks: In geology or reservoir engineering, gas content or gas saturation (S_g) expresses the volume fraction of pore space filled with gas.

- Food and beverage: In carbonation or fermentation, the term can refer to the gas content, such as dissolved CO2 in liquids or headspace gas.

Measurement and calculation:

Gasanteil can be determined by direct gas analysis (gas chromatography, mass spectrometry), volumetric methods, or sensor-based approaches. For dissolved gases, equilibrium methods and Henry’s law are commonly used. In porous media, laboratory or field tests quantify gas-filled pore volume relative to total pore volume.

Relevance:

Understanding the gasanteil is important for process control, safety, energy resources (gas reservoirs), environmental monitoring, and quality assurance in chemistry, geology, and food industries.