Cmperipheral Unisex Kids Vacuum Bell Jar Vacuuming Demonstration Hood Teaching Tools For Classroom Laboratory
Cmperipheral
Vacuum Bell Jar Vacuuming Demonstration Hood Teaching Tools for Classroom Laboratory.Feature: 1. Vacuum Sound Jar: Place the electric bell in the jar, and you can hear a clear bell, and then pull out the air, the bell will gradually weaken until no sound can be heard. Close the exhaust valve, so that students can observe. The bell still keeps ringing, but no sound can be heard. 2. More Experiments: A cup of boiling hot water has been discharged into the bell jar, and then pumped, you can see tha
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