Oil trademark Urals
The density of oil, like other hydrocarbons, is highly dependent on temperature and pressure[35]. It contains a large number of different organic substances and is therefore characterized not by the boiling point, but by the initial boiling point of liquid hydrocarbons (usually >28 °C, less often ≥100 °C in the case of heavy oil) and fractional composition - the yield of individual fractions distilled first at atmospheric pressure , and then under vacuum within certain temperature limits, usually up to 450–500 °C (~ 80% of the sample volume boils away), less often 560–580 °C (90–95%)
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