If you have seen a train running on the tracks, you may have seen sparks flying between the tracks and the wheels. Even if two iron objects hit hard, sparks erupt. Some types of stones also ignite if they collide with each other. Heat is generated by friction and shock. When iron objects collide, its fine particles fly away.
The heat generated by the shock also heats the particles. And since it is microscopic, it immediately turns red. So sparks are actually heated particles of iron. Friction and shock release energy. And more than that, it burns something nearby.
Even when the branches of forest trees are constantly eroded due to strong winds, sparks are generated and forest fires also start. In earlier times, fire was spread only by friction.
The primitive humans made a small hole in a large piece of wood and quickly turned the other piece of wood into it and rubbed it to get a fire. Flint was a means of generating iron fire.
The method was to light a fire by placing Rs. On the ground, rubbing two pieces of iron and throwing its sparks on Rs. There were small stones in the old lighter. Rotating a small metal wheel over the stone would ignite the nearby cotton wool. Fire has always come from friction.
Even after the discovery of Diwasali, the fire is manifested only by the friction of Diwasali and Patti. Gas lighters also produce fire sparks by striking a piece of piezo metal. Methods of generating heat from electricity were discovered after the discovery of electricity.
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