Ryes on the cover

Vacuum Sound Glass:

• Principle of operation: Place an electric bell in a glass ball to hear the ringing tone. Then pull out the air and the ring tone gradually disappears until it disappears completely. Close the exhaust valve that students can observe that the bell still vibrates, but does not seem no sound.
• More experiments: Fall hot water into a glass ball, and then pull out the air. You can see how hot water starts again. In addition, this instrument can be used for experiments such as: fountains in vacuo, freezing by evaporation, vacuum coating and atmospheric pressure.
• Easy operation: Handling device for demonstration of physical sounds is very simple, which makes students easier and more pleasant to protect knowledge during lessons.
• PVC execution: a transparent dome is made of high quality PVC material, thanks to which you can perfectly see an electric ringtone inside, which facilitates observation.
• Easy transport: Due to low weight and compact size, the entire vacuum set is very easy to transport outside.