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CONVECTION is a PROCESS: It is the vertical movement of matter (due ultimately to gravity) as a result of its relative density. A density change is often (but not only) caused by heating, which causes expansion of a parcel of fluid (gas or liquid) or even of some plastic solids. When a suspended solid or parcel of fluid is heated, the resultant expansion of ...


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According to Arnscheidt et al. (2019) "Atmospheric Evolution on Low-Gravity Waterworlds", the transition between "planet-like" and "comet-like" (escaping) atmospheres occurs at a surface gravity of around 1.48 m/s2. As a caveat, the waterworlds being considered in the paper are objects which have water reservoirs of 40% of the ...


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