Viscosity is the single most important physical property governing the formation, transport and eruption of naturally occurring silicate melts and magmas. Silicate melt viscosity is of fundamental interest to earth scientists, and in particular petrologists, volcanologists and geophysicists, because of the role it plays in governing melt production, magma ascent processes, styles of volcanic eruption, as well as, rates of physicochemical processes (e.g., degassing, crystallization). The viscosity of natural silicate magmas is a complex function of the temperature–pressure–composition dependence of the melt viscosity plus the non-linear effects due to the presence of included phases such as crystals and gas/fluid-filled bubbles...
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