What is blue blood? Detailed answer

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What is blue blood? Detailed answer

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What is blue blood?

In the Middle Ages and even later, pallor was a sign of the aristocracy. Unlike the common people, who earned their daily bread by hard physical labor, often under the scorching sun, the noble gentlemen had pale skin and were proud of it.

Skin color emphasized their high status. Blue vessels often shone through such skin. The rest of the population had an opinion that the blood of aristocrats is blue, although it, of course, is also red.

Subsequently, the expression "blue blood" acquired a figurative, often ironic meaning and became synonymous with the word "aristocracy".

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Why is there lead in gasoline?

Gasoline is a mixture of hydrocarbons. Its molecules are made up of hydrogen and carbon atoms. Gasoline, which is used as a motor fuel, is a mixture of several hydrocarbon liquids.

To make gasoline burn better, special additives are added to it. At a temperature of about 30 ° C, gasoline from a liquid turns into vapor very quickly. In a car engine, gasoline is mixed with air. The temperature of the engine turns the mixture into steam. The spark plug produces a spark that ignites the fuel.

Sometimes the gasoline mixture ignites too quickly. When this happens, the engine makes sounds and the engine is said to be knocking.

There are two ways to reduce engine knock. The first is to use gasoline, which is slowly flammable. Another way is to add special chemicals to the fuel that slow down the ignition. The best-known substance used for this is tetraethyl lead, or simply ethyl. This is why lead can be found in gasoline.

Fuels are classified according to how much knock they cause in the engine and are defined by octane rating. High octane gasoline produces less knock than low octane gasoline. Gasoline with an octane rating of 85 or higher is considered good enough for modern engines.

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