VOLUME RATIOS FOR N-PENTANE IN THE TEMPERATURE-RANGE 278-338-K AND AT PRESSURES UP TO 280 MPA

Volume ratios (V//p/V//0//. //1), and isothermal compressibilities calculated from them, are reported for n-pentane for seven temperatures in the range 278 to 338 K for pressures up to 280 MPa. The isobaric measurements were made with a bellows volumometer for which a novel technique had to be devised to enable measurements to be made above the normal boiling point (309. 3K). The accuracy of the volume ratios is estimated to be plus or minus 0. 05 to 0. 1% up to 303. 15 K and plus or minus 0. 1 to 0. 2% from 313. 15 to 338. 15 K. The volume ratios are in good agreement with those calculated from recent literature data up to the maximum pressure of the latter, viz, 60 MPa.