Experimental viscosity data /or rnetharre are presented for temperatures {rem 100 to 340F and pressures from 200 to 8,000 psia. A summary is given of the available data jor methane, and a comparison is presented for that data common to th~experimental range reported in this paper. Correlation oj the data is presented, and predicted values are given /or temperatures up to 460F and pressures up to 1P, 000 psia.

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A great variety of equations of state for gases and liquids has been proposed over the past 75 yrs. Within the past 20 yrs. equations of excellent accuracy over fairly extensive ranges of temperature and density have been proposed for the vapor phase, and in some cases application to vapor-phase mixtures has been demonstrated. To date no single equation of state has been shown to be applicable to both compressed vapor and liquid states. This paper reports the development of an equation which describes the vapor and liquid states of nitrogen in the temperature range to three times the critical temperature and the density range to three times the critical density, including the two-phase boundary. The root mean square error in density prediction over the range specified is 0.7%, and maximum errors in density prediction are less than 1.50/0, except in the vicinity of the critical point. The critical region itself is adequately described, if errors in pressure prediction are used as a criterion.Of the more recent equations of state proposed the work of Benedict, g +EEE€I -I

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