Surface tension is apparent at liquid-gas interfaces, resulting from intermolecular forces. This would imply that it matters which molecules constitute the liquid and the gas phase. However, when I look at tabulated date for surface tension, often only the liquid component is mentioned.
Does the strength of surface tension depend significantly on the constituents of the gas phase? Is there a large difference between the surface tension of e.g. the liquid-air interface versus the liquid-vapor interface?
If it matters what the gas phase consists of, is there a silent convention when quoting values in tables?