Abstract
An adiabatic calorimeter has been constructed for the study of properties of condensed substances in the temperature range 2° to 300°K. Two resistance thermometers were used, one of platinum for T>11°K and one of carbon for T 20°K but decreasing to ±0.5% at the highest temperatures. In conjunction with these measurements, vapour pressures were measured in the temperature range 66° to 86°K. The heat of fusion was found to be 284.5±0.4 cal mole-1, the triple point temperature 83.810°K and the triple point pressure 516.86±0.02 mm Hg. The amount of impurity in the specimen of argon was estimated to be 3 parts per million from a study of the melting range. Direct measurement of the heat of vaporization of the liquid gave the result 1563.6±4.6 cal mole-1 at 85.67°K, which corresponds to 1555.0±4.6 cal mole-1 at the normal boiling point.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
