When were rockets first used? Detailed answer

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When were rockets first used? Detailed answer

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When were rockets first used?

Have you ever watched a sprinkler - a lawn watering device that rotates, spraying water in a circle? Great, so you have seen the rocket principle in practice.

The water in the sprinkler rushes out with force in one direction, and this force pushes it in the opposite direction. In a rocket, the fast-burning propellant or explosive exerts pressure in one direction, and this causes the rocket to move in the opposite direction.

We live in the age of rockets, and it seems to us that they were invented by our contemporaries. In fact, the reactive principle has been known for a very long time. The Chinese used rockets for fireworks over 800 years ago! Then they became known in India and Arab countries. The first mention of rockets in Western Europe dates back to 1256.

As for the military use of rockets, at first they seemed to replace burning arrows: they were aimed at houses in order to set them on fire. Then the military and sailors began to use rockets for signaling, but for a long time it did not reach their real use in the war.

In 1802, a captain in the British army read how British troops in India had been attacked by rockets. This led him to the idea of testing them in the royal army. The experiment turned out to be so successful that very soon most of the armies of European countries, as well as the United States, began to use combat missiles.

In Europe, rockets were used in the Battle of Leipzig, in which Napoleon was defeated. In the United States, the British used live rockets to bombard Fort McHenry in the port of Baltimore. That's why the national anthem of the United States has words about the crimson glow of a rocket.

However, during the 2th century, artillery became more powerful and accurate weapons and began to replace rockets. As a result, they again lost their military significance. And this situation persisted until the Second World War and the appearance of the famous German rocket V-XNUMX.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What is blood pressure?

The heart is a pump that provides blood circulation in the body. When the left ventricle of the heart contracts, a push occurs. This pushes the blood into the arteries, which expand to receive the incoming blood. But the arteries have a muscular sheath that resists this pressure, and therefore the blood is squeezed out of them into the smaller vessels of the body. Blood pressure is the pressure exerted on the blood as a result of the contraction of the heart and the resistance of the arterial walls.

There are two types of pressure: maximum and minimum. The maximum pressure occurs when the left ventricle contracts; it is called systolic pressure. The minimum pressure observed before the next heartbeat is called diastolic pressure. When your doctor takes your blood pressure, he uses a device that records your blood pressure using a column of mercury that rises and falls under pressure. The scale is marked in millimeters, not inches. The average systolic pressure of a young person is approximately 120 millimeters of mercury.

Diastolic pressure is about 80 millimeters. Usually these numbers are indicated as follows: 120/80 or 120 over 80. When the blood pressure is within these limits, normal blood circulation is ensured without excessive stress on the walls of the blood vessels. But there are numerous deviations from these values, at which the pressure remains normal.

With age, blood pressure gradually increases, and by the age of 60 it has a value of about 140/87. Many factors affect blood pressure. Overweight people often have higher blood pressure than normal weight people. Stress, exercise, and even posture can affect blood pressure.

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