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We report measurements of the speed of sound in mixtures of N-methyl-2-pyrrolidinone and methanol at temperatures between 298.15K and 343.15K and at pressures up to 60MPa. The measurements were made using a dual path pulse-echo apparatus operating at a frequency of 5MHz. We have also measured the isobaric specific heat capacity of each mixture as a function of temperature at ambient pressure, by means...
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