The purpose of this communication is to firstly unite the thermal and mechanical descriptions of sunlight powered direct liquid propulsion systems at an elementary level. By this approach, any element of new mechanical energy by conversion from thermal one is considered to be as the result of work conducted by two motive forces in multiphase systems, which are principally equal in magnitudes and have opposite directions according to the law of momentum conservation. This provides the complex format of work to unit thermal and mechanical properties of liquids by direct conversion of sunlight on a joint elementary energy balance equation. The novel complex format of work to unite mechanics and thermodynamics on motive thermodynamic concept is introduced to right explain the mechanisms of gigantic motive forces firstly created experimentally in multiphase flows. By using both laser and solar optical pumping, the new vibration and capillary motive forces for mechanical propulsion were created to transport liquids directly by continuous light to serve as experimental basis to formulate Fist and Second Laws of motive thermodynamics. The outline of both branches of motive thermodynamics is given within the laws of energy and momentum conservation and non-equilibrium entropy of sunlight having terms responsible for both 1) renewable and 2) non-renewable processes to solve the fundamental problem of maximum light available for conversion.
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