Download or read book Second Sound in Helium II at High Pressures written by Canada. Dept. of National Defence and published by Directorate of Scientific Information Service. This book was released on 1958 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The propagation velocity of second sound was measured over the whole liquid helium II region at temperatures from 1.3K to the lambda-line. Curves were drawn for the transition of helium II to helium I and to solid helium. (Author).