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School Castelvì |
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Function To study the propagation of the heat. | |||
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Description The model is made of metal and glass. The Davy lamp is used as a safety lamp in the mines where we can have firedamp, i.e. a gas formed most of all of methane, that becomes an explosive mixture when mixed with air. In the Davy lamp the flame is surrounded by a metallic net that prevents it from passing outside. If some firedamp crosses the net, it produces a little explosion when it comes in contact with the flame. The flame dies out informing of the imminent danger. | |||
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School Azuni(1), Spano (2), Castelvì (3) |
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Function To study the conductivity of solids. | |||
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Description (1) The prismatic brass box is supported by four feet. In the upper part there is a hole where to put the thermometer. On the front and the back sides four bars of different materials with the same section (iron, copper, silver, lead, glass, sulphur), are placed and covered with a white film wax. Under the box the heater must placed. The quantity of melted wax on every bar depends on its conductibility. | |||
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School University |
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Function To study the conductivity of solids. | |||
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Description A prismatic metallic little basin leans on a rectangular metallic basis. From it rise two brass little columns joined, at the top, by a horizontal pierced bar. Four poles of different materials pass across the holes of the bar and they go down into the little basin. The top of the poles are covered with wax. By filling the little basin with warm water, the heat propagates along the poles. The quantity of wax melted will be proportional to the conductivity of the poles | |||
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School Spano |
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Function To study the propagation of the heat in solids. | |||
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Description The homogeneous iron bar rests on feet of brass and is separated from these by small plates of cement asbestos. The five holes of the bar are partially filled with mercury, and five identical thermometers are placed into it. At the beginning the thermometers are at the same temperature. With a Bunsen burner the protruding end of the bar is warmed, while the thermometers are protected with a double screen of aluminium. The apparatus is made completely of metal and it is easily decomposable. | |||
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School Spano |
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Function To study the propagation of heat in liquids |
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Description The apparatus is formed by a glass container with a brass reservoir for the boiling oil with a differential thermoscope bearing three lateral holes for the thermometers. After filling the great test-tube with water or another liquid, the reservoir is put on the container and filled with warmed oil. The upper thermometer will show that the temperature increases, but the bottom thermometer remains stationary. A differential thermoscope with unequal branches completely immersed in the liquid is more indicated for an objective demonstration. | |||
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School Spano |
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Function Comparison between specific heats of solids. | |||
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Description This is the classical model with a disk of paraffin, an iron tripod, a support for five balls of different metals (iron, zinc, copper, tin, lead), and a brass plate to melt the disks of paraffin and to prepare new ones. The balls have the same weight and the same diameter, as we have emptied the centre of those made of denser metal to obtain equal surfaces of contact. The tripod must be used in the two ways with the plate at the bottom to hold the disk, that leans on the thin plates protruding from the feet; with the plate at the top to melt the disk. | |||
