Abstract
Speeds of sound (at 2 MHz) have been measured for liquid propane between 200 and 340 K and for liquid n-butane between 200 and 375 K. The pressure variations cover the region from the coexistence line up to 60 MPa. The inaccuracy of the experimental results is lower than 0.2 per cent. The measurements were used to establish two equations: one for the speed of sound over the whole range as a function of temperature and pressure, and a second along the coexistence line as a function of temperature only.
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