This paper presents a new wide-ranging correlation for the viscosity of cyclopentane based on critically evaluated experimental data. The correlation is designed to be used with a recently developed equation of state, and it is valid from the triple point to 360 K in the liquid range up to 380 MPa and 460 K in the low-pressure vapor range. The average absolute percent deviation of the fit for all primary data is 0.8% with a bias of −0.3%. The estimated expanded uncertainty of the whole fit is 2.7% (at the 95% confidence level), while the uncertainty near atmospheric pressure from 298 K to 460 K increases to 4%. The correlation behaves in a physically reasonable manner when extrapolated to 500 MPa; however, care should be taken when using the correlations outside of the validated range.

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