Flight of the balloon - an unforgettable show. In complete silence the huge sphere slides above the ground. Only the equal rumble of the gas burner allowing to proceed to this surprising swimming reaches.
Aeronautics origin
Everything began with modest experiments in June, 1783 when brothers Joseph and Jacques Mongolfye began to experiment with balloons from the fabric which is pasted over with paper. The first successful experience with a ten-meter sphere forced them to believe in good luck, and demonstration of an innovation to the king and his suite in Versailles became the following step.
The duck, rooster and sheep who safely returned on the earth as soon as hot air in a sphere began to cool down became the first passengers of the Mongolfye balloon. After a number of experiments in November, 1783 Mongolfye's sphere lifted in air of two brave volunteers who, balancing on the opposite sides of a wicker basket, tirelessly threw in the furnace over the head straw and wool.
Modern montgolfiers
Modern aeronautic spheres technically differ from the invention of brothers the Montgolfier a little. Yes, they are equipped with propane gas burners, and their cover made of modern materials is extremely easy and strong, but the essence remained the same. The same sphere filled with hot air. Same silent swimming. Certainly, there are both other designs, and a sphere it is possible to fill not only warm air, but also other light gas, for example, with helium, but the essence remains the same. There was a period when spheres were filled with hydrogen, but because of potential of explosion it was necessary to refuse this substance.
Why the balloon flies
Speaking about the principle of flight of devices it is easier than air, it is free or involuntarily it is necessary to remember the great scientist Archimedes. Its opening is the cornerstone of fascinating flight of balloons. Carrying power of the balloon is described by the famous ancient Greek: any body shipped in liquid or floating in air is affected by the pushing-out force directed up and equal to the weight of the liquid which is forced out by it or air. As helium or warm air are much lighter usual cold, there is a lifting or pushing-out force forcing to soar the balloon. In the sum the weight of all elements of a sphere is much less, than the volume of the air which is forced out by it. The same principle is underlain also in navigation of huge ocean vessels whose weight is estimated in tens of thousands of tons, and the displacement of hundreds thousands. Here so, submitting to Archimedes's law, balloons and airships also fly, and by the seas huge tankers and terrible aircraft carriers float.