1.1 This test method provides a calculation procedure for converting data obtained by Test Method D 972 to apparent vapor pressures and molecular weights. It has been demonstrated to be applicable to petroleum-based and synthetic ester lubricating oils, at temperatures of 395 to 535K (250 to 500oF). However, its applicability to lubricating greases has not been established. Note 1--Most lubricants boil over a fairly wide temperature range, a fact recognized in discussion of