What is engraving? Detailed answer

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What is engraving? Detailed answer

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Did you know?

What is engraving?

This is a drawing carved on wood, linoleum, metal, etc., and then printed on paper.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

How can the flame be extinguished?

Let's start with how fire is made. This requires three things. First, you need a fuel, such as wood, paper, alcohol or gas. Second, you need oxygen. Fuel reacts quickly with oxygen. When wood burns in a fire or gas in a stove, the fuel quickly reacts with the oxygen in the air. The third thing you need is warmth. Paper or wood simply left in the air does not burn. But a burning match brought to the paper ignites it. When the paper becomes hot enough, oxygen begins to freely interact with it and the paper ignites.

There are three main ways to put out a fire. In each of them, one of the components necessary for combustion is removed.

The first way is to remove the fuel, that is, what caught fire.

The second is to stop the supply of oxygen. For example, a fire cannot burn in carbon dioxide, so a blanket of carbon dioxide can be created to extinguish the fire. The oxygen supply stops, the fire goes out.

The third way is to put out the fire, eliminate the heat, lower its temperature. To do this, a jet of water is directed at the fire. The water absorbs the heat of the burning material and lowers the temperature. The temperature drops below the combustion temperature and the fuel stops burning.

In some cases, the flame cannot be extinguished with water. For example, oil or fat floats on water. If you try to put out such a flame - for example, a frying pan with burning fat - with water, then the burning fat will float up and continue to burn.

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