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Vacuum experimentBefore the experiment, the valve cone around the rubber sealing ring should be coated with a layer of Vaseline (self provided), and the valve nut should be tightened. |
Sound propagation experimentInstall the battery of the electric bell (provided by yourself), turn on the switch, the electric bell rings, and then put the bell cover on the base, and the clear electric bell can still be heard through the bell jar. Connect the air extraction device (provided by yourself) to extract the air inside, the electric bell will gradually weaken until no sound is heard,close the valve on the base and let the students observe that although the hammer of the electric bell is still beating the bell, no sound can be heard. |
Low pressure boiling experimentPut a cup of hot water that has ceased to boil into the bell jar, and draw air, then you can see that the hot water will boil. |