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  • The Marangoni number is a dimensionless number named after Italian scientist Carlo Marangoni. The Marangoni number may be regarded as proportional to surface tension forces divided by viscous forces. It is – for example – applicable to bubble and foam research or calculations of cryogenic spacecraft propellant behaviour. γ: surface tension,; L: characteristic length,; : thermal diffusivity,; η: dynamic viscosity,; ∆T: temperature difference,.