It is genetic - in my family there is no history of it as it is a recessive gene but my mum and dad were both carriers. In Scotland up to 13% of the population has red hair, but around 40% of the population is thought to carry the recessive gene responsible for the world's rarest natural hair colour.
On the other hand, synthetic base oil molecules are chemically controlled, which provides increased ï¬ lm strength and lubricity over petroleum oils. The performance qualities of base oils have a marked impact on the performance qualities of the ï¬ nished product.
Crude Oil and Natural Gas: From Source to Final Products. Crude oil and natural gas are mixtures of hydrocarbons-chemical molecules that contain only hydrogen and carbon. Crude oil is a liquid both underground and at normal surface conditions. Natural gas is a vapor at normal surface conditions; underground, it can exist either as a vapor or something like a bottle of carbonated soda-in solution with crude oil until the pressure is reduced.