Transformations diagrams

	Emile Clapeyron (1799 - 1864) Clapeyron was the first man to graph the transformations. J.Watt had yet used those diagrams but he hadn't divulged them.
		When the gas pressure keeps constant the transformation is named *isobaric.* In a isobaric transformation the volumes are directly proportionals to the thermodynamics temperatures. The inlet stroke in a steam engine is an isobaric stroke. For the thermodynamics temperatures is used the Celsius scale but the thermodynamic scale begin from -273°C (the absolute zero).
		When the gas volume keeps constant the transformation is named *isometric.* When the exhaust-valve of a steam engine opens, originates an isometric stroke.
		When the gas temperature keeps constant the transformation is named *isotermic.* The gas temperature can to keep constant when is possible to exchange the heat with the outer ambient.
		When the transformation occurs without heat exchange with the outer ambient the stroke is named *adiabatic.* The gas temperature increases (or decreases) affecting the pressure state.
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