Measurement and correlation of the (p, ρ, T) relation of liquid cyclohexane, toluene, and ethanol in the temperature range from 233.15 K to 473.15 K at pressures up to 30 MPa for use as density reference liquids

摘要: Abstract Comprehensive (p, ρ, T) measurements on cyclohexane, toluene, and ethanol were carried out in the homogeneous liquid phase for temperatures from 233.15 K to 473.15 K at pressures up 30 MPa. The performed by using an accurate single-sinker densimeter based Archimedes’ buoyancy principle. total uncertainty of density was estimated be 0.015% (level confidence 95%). Based experimental results, correlation equations three liquids have been established; their is 0.020%. Comparisons with previous results other experimentalists values calculated current state are presented. In this context it also shown that a can vary slightly depending batch used measurements. purpose work provide densities selected so these as reference calibration densimeters and, particular, vibrating-tube densimeters.