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How much mechanical energy, i.e. exergy could one extract from a gaseous, pressurized  fluid at a pressure P1 and temperature T1 when it expands in an adequate engine?

All kind of Rankine or steam engines need a suitable fluid, that reacts to heating with an increase in pressure. The increased pressure of the fluid will be used to drive a piston, a turbine blade, lift a mass … and generate power. In this sense the fluid can be called “power fluid”. The following charts show graphs of the vapor pressure (bar) versus the temperatures (°C) for several fluids. The second chart uses a logarithmic vertical axis.

Inspired by Buddhist's prayer wheels, Chinese paper laterns, the German Weihnachtspyramide and experiments with paper folding ...

An illuminated and rotating Paper Lantern driven by a candle.

Or more technically: a simple demonstration of the conversion of heat into a rotational movement i.e. kinetic energy.