**Butene**

Butene provides high accuracy thermodynamic properties for 1-butene (C4H8, MW 56.106 g/gmole, CAS No. 106-98-9) using the Fundamental Equation of State presented in:

Lemmon, E.W. and Ihmels, E.C.,

"Thermodynamic Properties of the Butenes. Part II. Short Fundamental Equations of State,"

Fluid Phase Equilibria, 228-229, pp.173-187, 2005.

The correlation is valid for temperatures in the range between triple point at 87.8 K to 525 K for pressures less than 50 MPa.

Enthalpy and entropy values are referenced to for saturated liquid at the normal boiling point of 266.8 K.

__Transport properties are provided using correlations given in:__

Yaws, Carl L., ed. ** Chemical Properties Handbook**. New York: McGraw-Hill, 1999.

__Surface tension data are provided using the information in:__

Mulero, A., Cachadina, I, and Parra, M.

"Recommended Correlations for the Surface Tension of Common Fluids"

J.Phys. Chem Ref. Data, Vol. 41, No.4, 2012