The effect of hydrostatic pressure on the formation of air-hydrate crystals

• Main Authors: Tetsuya Ikeda, Tsutomu Uchida, Shinji Mae
• Format: Report
• Language: English
• Published: Department of Applied Physics, Faculty of Engineering, Hokkaido University 1993
• Subjects: Polar meteorology and glaciology; Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3775; http://id.nii.ac.jp/1291/00003775/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3775&item_no=1&attribute_id=18&file_no=1

The transformation of air-hydrate crystals from air-bubbles in ice was observed by a microscope at 270K under high hydrostatic pressure between 19.6 and 34.3MPa during the period of 16 days. The number concentration of the air-hydrates formed by the pressurization was measured and was compared with the number concentration of the air-bubbles included. It was found that the transformation rates calculated from these number concentrations increased from 0 s^<-1> at 19.6MPa to 5.4×(10)^<-9> s^<-1> at 34.3MPa. The transformation process is discussed in terms of the nucleation theory of the crystal.