What is crude oil

crude oil is a highly flame able liquid substance naturally found in the land which is a mixture of mostly hydrogen and carbon with small quantity of 

some other particles like sulfur, oxygen and nitrogen , crude oil we can call it raw material of oil which is need to be reined for use , because when we extract oil from the earth it is a mixture of hydrocarbons along with small quantity of other chemical compounds that contains sulfur , nitrogen and oxygen and small amount of other compounds, this complex mixture of mention elements is crude oil , in refinery process what we do , we separate oil elements to get different petroleum products like gasoline , diesel ,propane and use them for various benefits.

kinds of crude oil    crude oil is of many kinds depending upon the quantity of above mention non hydrogen and carbon particles in this liquid , for example if in the crude oil the amount of sulfur is less then 0.5 % then it is cad sweet crude oil , kinds of crude oil is as below.

heavy crude oil,   sweet crude oil,   sour crude oil,     light crude oil,    medium crude oil,    conventional crude oil,