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Because crude oil is a mixture of different chemicals - mainly hydrocarbons - that have different evaporation temperatures. Roughly speaking, when the crude is heated, its temperature rises until it reaches the lowest vaporisation temperature. The temperature then remains more or less steady as the heat input is used as the latent heat of vaporisation for the relevant compound. When [almost] all of that compound has evaporated, the temperature starts rising again until it reaches the next varorisation temperature, and so on.
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What is the difference between birth rate and crude birth rate?
Crude birth rate is how many live children are born. Crude death rate is how many people die. Crude death minus crude birth is the net gain (or loss) and is called the birth rate. It represents whether or not deceased people are "replaced".
What is true about I statement?
They made be crude or sophisticated
What does Black Gold refer to?
crude oilAnswerit is oil also know as Texas tea
What is the difference between an intelligent guess and crude guess?
a crude guess is just a mere guess while the intelligent guess is likely to happen due to your experience
What is the Difference between crude death rate and actual death rate?
Death Rate is the actual rate of death where Crude Death Rate is a guess on the death rate.
