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This Part of ISO 4126 contains information which is common to Parts 1 through 6 of ISO 4126 to avoid unnecessary repetition. The user is cautioned that it is not recommended to use the ideal gas formula presented in clause 6.3 when the relieving temperature is greater than 90 % of the thermodynamic critical temperature and the relieving pressure is greater than 50% of the thermodynamic critical pressure. Additionally, condensation is not considered. If condensation occurs, the method presented in clause 6.3 should not be used.