In order to accurately measure the isobaric specific heat capacity of liquid n-decane

a flow adiabatic calorimeter was constructed for subcritical pressure and supercritical pressure. The isobaric specific heat capacity of n-decane was measured at temperatures ranging from 311 K to 570 K and pressures ranging from 0.12 MPa to 6.02 MPa. The results show that the isobaric specific heat capacity of n-decane increases as the temperatures rise. And the system pressures have little effects on the isobaric specific heat capacity of n-decane. The experimental results were compared with the reference data. The results show that the maximum absolute deviation (MAD) is within 5.0%

and the average absolute deviation (AAD) is below 1.39%. Meanwhile

the experimental results were compared with Guseinov and Garg models. Based on the two empirical models

the improved isobaric specific heat capacity model was proposed. The improved model has higher fitting accuracy

showing that the MAD is 1.32%

and the AAD is 0.53%

which provides a basis and reference for the calculation of isobaric specific heat capacity of other hydrocarbon fuels.