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    Undergrad How long for heat to balance between 1 m³ water at 23°C and 1 m³ air at 20°C?

    If i have let's say have 1 cubic meter of water at a temperature of 23 degree, in a closest system connected to a 1 cubic meter of air of 20 degree, how long time does it take for the heat to balance out, the surface between the two a 1 square meter.