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School Azuni |
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Function To measure the compressibility of liquids. | |||
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School Spano |
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Function To study the propagation of the pressure of liquids and gases. | |||
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Description The apparatus is formed by a hollow sphere of brass, that presents seven holes of 10 mm, at which a pump with piston is applied, provided with two opposite leather caps, so as to work through suction and pressure. In the holes of the sphere the glass manometers are inserted with the help of rubber stoppers. For experiments with liquids it is necessary to put mercury in the manometers; for the gases a drop of coloured water is enough. | |||
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School University (1), Castelvė (2) |
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Function Studying the principle of communicating vessels | |||
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Description (1) A set of transparent tubes of different shape and with a tap comes out of a cylindrical container. The liquid is poured into a central tube. We see that it reaches the same level in every tube. | |||
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School Castelvė |
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Function Studying the principle of communicating vessels. | |||
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Description A U shaped tube filled with mercury is placed on a wooden frame made of a basis and two vertical planks. The left side of the tube is shorter and ends with a goblet from which a horizontal little tube with tap branches off. On the plank two scales are drawn. Besides, an index is placed on a plank . For the experiment we fill the goblet with a liquid different from mercury. | |||
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School Spano |
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Function Transforming the forces. | |||
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Description It is formed by two glass cylinders of different sections in which there are two pistons. The liquid that is used is water. The first piston behaves as suction and pressure pump tanks two valves that allow the influx of the liquid from the tank and the efflux towards the second cylinder. | |||
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School Spano |
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Function To study the vertical thrust upwards. | |||
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Description It is formed by a cylindrical glass tube held by a ring with three rays, used to lay the tube on the edge of a large container and of a disc of emery glass. The latter has a central jointure and hangs from a string with a ring. For this experiment it is better to use water coloured with uranine or fuchsine. | |||
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School Spano |
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Function It is used together with the hydrostatic balance to verify the Archimedean principle. | |||
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Description A massive cylinder of nickered brass is equipped with a hook at an end. Another cylinder adapts perfectly to the first. The latter is equipped in his turn with an eyelet and a hook, through which the two cylinders can be hang from the hydrostatic balance | |||
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School Spano |
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Function To study the variation of the pressure with the depth. | |||
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Description It is formed by an 80 cm high test tube and a manometer formed by a U tube with a 90 cm long branch. We fill the test tube with water and the manometer with mercury. Then we dip slowly the manometer into the water. We can see that the difference of level of the mercury in the two branches increases proportionally with the depth. | |||
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School Spano |
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Function To study the pressure on the bottom of containers, based on the principle of the communicating vessels. | |||
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Description The apparatus is formed by a U tube, with a shorter branch that ends with an escutcheon on which we can screw three glass containers of the same height, but with different capacities and forms. The U tube is filled with mercury up to the height of the escutcheon. Then we fill the containers with water up to the same height. We can note that the height of the mercury in the other branch is the same in the three cases. A little tap placed on the escutcheon is used to discharge the water after each experiment. | |||
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School Pellegrini |
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Function To study the pressure on the bottom of containers, based on the principle of the communicating vessels. | |||
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Description It is formed by a container with the membrane. That membrane changes form under the weight of the liquid and moves a lever. | |||
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School Spano |
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Function It is used to demonstrate the compressibility of the gases and the incompressibility of liquids. | |||
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Description It consists of an empty glass statuette with a very little hole placed sideway (usually in the point of the tail) floating in the water. We fill with water a container with a diameter inferior to the length of the little devil, so that the statuette cannot overturn. The little devil is put into the container, that ids covered with a membrane not let the air in. By pressing the membrane, the water enters in the little devil that falls to the bottom. | |||
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School Spano |
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Function Transformation of potential gravitational energy into kinetic energy. | |||
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Description When the wheel is set in motion from upside, the water gradually fills the sections one after the other and provokes its motion by the almost exclusive action of its weight. When the wheel is set in motion from the bottom, the water acts largely by collision and very little by the effect of its weight, because the wheel bears only a part of the weight. | |||
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School Spano(1), Castelvė (2) |
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Function Transformation of gravitational potential energy in kinetic energy. | |||
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Description (1) It is formed by a vertical tube closed at the lower end and held by a frame. Four little tubes placed at 90° and folded at right angle are welded to the lower side. The set is made of a painted metallic plate. The water poured into the tube comes out of the little tubes horizontally and, for the principle of action and reaction, they turn in the opposite direction. The water is collected in a container that also holds the frame. | |||
