Fluid mechanics is primarily a manipulation of Bernoulli's principle, which is simply the equivalence of the various forms of Newtonian energy in fluid form, pressure, elevation in a gravitational field, velocity of mass. They can be easily, and are routinely throughout the mechanical world, transposed to one form or the other. When a bungee jumper departs the New River bridge, his initial potential energy of elevation is variously transformed into the kinetic energy of descent, the extended energy of the spring (bungee cord) and his changing elevation; and subsequently transformed back again, ad infinitum until entropy saps it all.
As posts #42 and #45 above imply, nuclear energy, gasoline, coal, and renewables, are all the same thing. It can be measured in Joules, BTU's, calories, electron volts, and a few other units. But all the same thing. And the sooner ignorant politicians, and economists, understand it the better off we, in the United States, will be.
This arrogance knows no party boundaries.
But they do not have the same applications or the ability to be used for transportation.