The “ideal gas” law The well-known, encyclopaedic experimental data (about gas compressability factor) show the general trend: the more rarefied gas the more accurate “ideal gas” law, or the same in other terms: the higher vacuum the more accurate “ideal gas” law. 1) Are another experimental data which contradict the trend ? 2) Are the theory which explains the trend ? (Classic or quantum molecular-kinetic theories do not considered as absolutely unsuitable). 3) Does your conclude the so called “ideal gas” is namely vacuum ?