THE MIKER TECHNIQUE.
Abstract
A new momentum recoil technique has been developed for determining the vapor pressure and average molecular weight of the high temperature, low pressure vapor species. The Microbalance-Inverted Knudsen Effusion Recoil technique (the MIKER technique) employs an inverted Knudsen effusion cell with a diverging conical orifice. The construction of a special vacuum microbalance for the Miker technique is described. The average molecular weight of silver vapor at about 1325K was 62 = 5 (quartz effusion cell) and 73 = 5 (graphite cell). The average molecular weight of tin vapor over the range 1332 - 1504K was 92 = 14. The average molecular weight of calcium fluoride vapor over the range 1521 - 1707K was 77 = 7. The vapor pressure of gold from rate of effusion measurements over the range 1533 - 1673K yields a least squares solution of log P = 7.0184 - 19964/T. Determinations with a sample-blocked orifice yielded an unexpected logarithmic temperature effect on the recoil force. An analysis is presented which corrects for effusion which occurs during the cooling period of the effusion cell.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1965
- Accession Number
- AD0625839
Entities
People
- James Edward Bennett
Organizations
- Oklahoma State University–Stillwater