Liquid Flow Measurement
Oil is big money. When large volumes are involved, little volume differences mean big money. It's worthwhile, then, to correct volumes to some known set of conditions.
The most significant factor for most condensates and crude oils is temperature. Pressure doesn't have a big effect on the density of most liquids (the main exception is ethane, which is 'spongy' and changes density significantly when under pressure). The effect of temperature on density is more significant.
There are a couple of calculations that have been created to correct for the effect of temperature on the density (and therefore the volume) of hydrocarbon liquids. There's one calculation that uses the density of oil at 15 Deg C to predict the density of the oil at other temperatures. This is table 53A.
There's another calculation that uses the measured density of oil at a measured temperature and back-calculates the density of the oil at 15 Deg C. This is table 54A.