The falling-body viscometer was structurally improved and used in thedetermination of liquid viscosities of 294 points for four pure substances

tetra-hydrofuran

acetone

methyl-cyanide and aniline

and three binary mixtures

benzene + cyclohexane

1-propanol + n-heptane

and n-butanol + n-heptane

under pressure from 0.1 to 29.5 MPa in the temperature range from 298. 15 to 348. 15K (±0.05K). A correlation equation of liquid viscosity with density under high pressure was proposed. The equation was used to correlate the viscosity data of 1049 points of 34 substances of various types in a pressure range from 0.1 to 500MPa and at a maximum temperature variation of 170K. The overall average relative deviation was 2.64%

much lower than 29.33% of the Dymond correlation.