title: Control of ultralow pressures: an absolute thermodynamic manometer.
abstract: A method of accurately manipulating the pressure of helium gas in the range P=10(-1) to 10(-20) Torr, T<5 K is presented. The method requires only a very modest apparatus and makes use of thermodynamic measurements on the 4He-Grafoil system. A calibration curve and a pressure scale for the manometer are developed which will allow convenient application in other laboratories. An experiment which utilizes the technique is briefly disscussed.
authors.affiliation: California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: P
authors.initials: P
authors.lastname: Taborek
authors.forename: D
authors.initials: D
authors.lastname: Goodstein