This study aims to determine the relevance of the convection during the hand-waterinteraction by quantifying the power during one cycle of an immerged hand in action. It is a first attempt to determine that power, as a wattage, in connection with a convective scale system. Also for the first time a uncommon approach is being pursued namely to determine power usinf merely variables like i) mass mw, i i) l ength of the working path of the hand during breaststroke d_im and iii) duration of the hand-water interaction T_im. To determine the displaced water mass mw the displaced water mass, which has hitherto been known for the Archimedean buoyancy directed towards the waterline, is used. Last but not least, the calculation methods are outlined.
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