Compressibility and thermal expansion of petroleum oils in the range 0 degrees to 300 degrees C

Measurements of compressibility and thermal expansion are reported on representative samples of petroleum oils from various sources over the pressure range to 50 kg/cm 2 (gauge), and the temperature range 0°t o 300°C.It was found from the results obtained on these samples that the compressibility and thermal expansion of two samples of the same specific gravity, but from different sources, differed more than 30 per cent at the higher temperatures, whereas oils of the same specific gravity and also the same viscosity had the same compressibility and thermal expansion within rather narrow limits.In other words, with a knowledge of the specific gravity and viscosity of the oils, it was possible to represent all the measured volumes within less than 0.5 per cent over the entire range of temperature and pressure covered by the measurements.