Abstract
Precise constant-temperature control of a computer-automated, simultaneous-Knudsentorsion-effusion machine for measuring vapor pressures renders it capable of thermogravimetry with the rates of momentum loss and mass loss as probes. The former rate is proportional to the vapor pressure within the effusion cell. Virtual thermogravimetry is accomplished with temperature programs other than constant programs. Chemical transitions and new compounds are discovered from functional dependencies of vapor pressure and its differential on time and chemical composition. The technique is illustrated with examples from studies of a variety of vaporizing systems. The efficacies of various temperature programs are discussed. Unusual cases of increasing rate of mass loss at constant temperature and of increasing vapor pressure when the temperature is lowered have been discovered by this method and are presented.
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