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Mounted on ABS plastic base of size 250x175mm. A pressure gauge is connected to the connectiontube of 50 ml gas syringe. Demonstrates the relationship between the pressure and volume of a closed quantity of gas at constant temperature. A gas volume of 50 ml. is closed, in the gas syringe. A pressure gauge is connected to the connection tube of the gas syringe to measure the pressure. The gas syringe plunger is pushed in or pulled out of the syringe and the volume and the pressure of the gas are reduced. Mounted on ABS plastic base of size 250 x 175 mm