Specific Heat Capacity at Constant Volume for Water, Methanol, and Their Mixtures at Temperatures from 300 K to 400 K and Pressures to 20 Mpa

Published

October 1, 2001

Author(s)

T Kuroki, N Kagawa, H. Endo, S Tsuruno, Joe W. Magee

Abstract

Specific heat capacities at constant volume (c_v) of water, methanol, and their mixtures were measured with a new adiabatic calorimeter. Temperatures ranged to 20 Mpa. Densities were determined at the initial and final end points during each calorimetric experiment. The calorimeter is a twin-cell type whose sample and reference cells (33 cm³) and their shields are heated by electric power. The cells are surrounded by a high vacuum. During the experiment, the heating power was carefully controlled so that the cell temperature increased uniformly. The reference cell was always evacuated and was heated with a constant current. The temperatures of the sample cell tracked that of the reference cell temperature by means an automatic control system. Automated sample pressure measurements were made with a crystal quartz transducer. The expanded relative uncertainty for c_v is estimated to be 1% for liquid-phase measurements, and for density it is about 0.2%.

Citation

Journal of Chemical and Engineering Data

Volume

46

Issue

No. 5

Pub Type

Journals

Keywords

adiabatic, ammonia, calorimeter, gases, heat capacity, isochoric, liquids, mixtures, water

Citation

Kuroki, T. , Kagawa, N. , Endo, H. , Tsuruno, S. and Magee, J. (2001), Specific Heat Capacity at Constant Volume for Water, Methanol, and Their Mixtures at Temperatures from 300 K to 400 K and Pressures to 20 Mpa, Journal of Chemical and Engineering Data (Accessed October 16, 2025)