Classic ice cave literature is oriented toward bedrock caves that include perennial ice (Persoiu & Lauritzen, 2017, and references therein). In the literature on ice caves formed within glaciers, conduit development results mainly from flowing water, either through moulins or along the glacier base (Gulley et al., 2009). While air flow in ice caves and resulting ice melt has been investigated through the lens of "cold-air traps" or the "chimney effect" (Bertozzi et al., 2019; Luetscher & Jeannin, 2004; Meyer et al., 2016; Williams & McKay, 2015), these processes do not adequately describe systems that are formed entirely within ice and solely from advective air flow driven by temperature and pressure gradients at the ice-bedrock interface. Strictly speaking, this last category is glacio-thermo karst and is amplified in regions with increased geothermal gradient and, therefore, high heat flux. These high heat flux regions are often volcanic settings, glaciovolcanic caves. The speleogenesis of glaciovolcanic caves is one of thermal equilibrium. Heat flux creates melt, and on active volcanic edifices, this glacial melt percolates into the bedrock and undergoes a phase change to steam. Heat flux may be by conduction where the heated bedrock and ice are in contact (Giggenbach, 1976), but heat transfer by radiation and convection dominate where melt-formed voids that separate bedrock and ice. Discrete fumaroles of steam and volcanic gas, as well as thermal springs, enhance cave formation; the size and shape of the "fumarole ice cave" (Curtis & Kyle, 2011; Pflitch et al., 2017) is guided by the magnitude and locus of heat flux, larger cross sections form near concentrated fumarole and spring activity and localized heat transfer by convection (Kiver & Steele, 1975). The positive pressure gradient from fumarole activity causes lateral and vertical advection of steam and volcanic gas toward the glacial margins or moulins, which can enlarge and connect voids into conduits for moisture, volcanic gas, and heat transfer, such as on Mount Erebus in Antarctica (Wardell et al., 2003). Thermal equilibrium and, therefore, advection through conduits in fumarole ice caves is modulated by short-and long-term changes in volcanic activity and external climate. Certainly, volcanism may rapidly

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This work evaluated the predictive accuracy of the local composition model (LCM) formulation developed by Li et al. (1986) for four binary, vapor‐liquid equilibria (VLE) mixtures. The four components comprising these mixtures were benzene, triethylene glycol (TEG), water and methane, while the mixtures examined in this work were the benzene‐TEG, water‐TEG, methane‐TEG and methane‐benzene systems. The Khan‐Chung‐Lee‐Starling (KCLS) equation of state developed by Chung et al. (1984) was used with the LCM to predict the VLE behavior of these systems. The accurate results obtained in this work may be applied to the design of natural gas dehydration processes.