CAT NO: DIDACTICELECTROMETER0023
VACUUM JAR WITH BELL.
VACUUM JAR WITH BELL Sound propagates only in a conduction medium. The oscillations of the sound source (bell) arrive at the receiver (ear) through the propagation medium (air). If there is no propagation medium near the sound source (vacuum inside the jar), sound cannot be sent from its source to the receiver. If vacuum is realized inside the jar, no sound can be heard, although the hammer strikes the gong. Blowing air gradually into the jar, at the beginning sound is very faint and then it becomes louder and louder. The electric bell operates at 4-6 Vac and it hangs by a rubber string inside the jar. The vacuum pump is equipped with a plate for the glass jar. TECHNICAL CHARACTERISTICS: Pump: - Flow rate: 38 l/min - Vacuum: 650 mmHg - Weight: 4,8 Kg Vacuum jar: - Dimensions: 25 x 14 cm - Bell: 4-6 Vac