Kinematic technique of ideal gas thermodynamic surface forming

It is offered the kinematic technique of ideal gas thermodynamic surface forming by means of driving the straight isobar or isochor. It is obtained the existing geometric constraint between macroscopic parameters of ideal gas, and the algorithm is derived that allows determining the unknown parameter by two given values, and also the value of molar constant by the simple geometrical constructions. The geometric proof of Charles´ law is given using only Fales´s theorem well-known from geometry. The thermodynamic process is simulated in the form of the curve that the state point circumscribes on the thermodynamic surface during the process.