Vacuum Phenomenon
★Exhibit Content: Interactive science popularization experience of physical principles such as sound propagation medium, relationship between air pressure and volume, weight of air, reaction force, and no wind in vacuum ★Interaction: Electromechanical interaction ★Operation: After pressing the button, the bell jar is evacuated, and visitors observe the changes inside the bell jar. ★Exhibit Description: The main body of the exhibit is a transparent vacuum bell jar, inside which five sets of experimental devices are placed simultaneously: electric bell, Hero's engine, air balance, fan and cloth strips, pre-inflated balloon. Visitors operate the corresponding buttons on the control panel to start the vacuum pump to extract air from the bell jar, and observe the synchronous changes of the five devices under vacuum, intuitively understanding the physical principles such as sound propagation medium, relationship between air pressure and volume, weight of air, reaction force, and no wind in vacuum. ★Scientific Principle: 1 Can we hear sound without air: Sound propagates through media such as air. In a vacuum, there is no air as a transmission medium. Although the hammer of the electric bell is still striking the bell, we cannot hear the sound. 2 Hero's engine: During the evacuation process, the air inside the sphere needs to balance with the bell jar, so it sprays out from the thin tubes at both ends. Under the action of reaction force, the sphere rotates. 3 Weight of air: There are two bottles at both ends of the balance inside the bell jar, one sealed and one open, and the balance is leveled with weights. After the bell jar is evacuated, because the air in the open bottle is also extracted, the balance tilts. 4 No wind in vacuum: In a vacuum environment, the rotation of the fan cannot stir the air, so it cannot blow the cloth strips in front. 5 Why does a deflated balloon inflate again: After the bell jar is evacuated, the air pressure decreases. The air inside the originally deflated balloon cannot escape, and it exerts outward pressure on the balloon wall, causing the balloon to expand.
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- 1.7×0.35×2.1 1.7×0.35×2.1Dimensions (unit: m) 1.7×0.35×2.1 Brand: PopsciCat Model: PopsciCat-mechanics-195 1. Materials ① Main cabinet: Q235-1.5mm sheet metal with baked paint (light orange, scratch-resistant and wear-resistant) ② Experimental components: 5 sets of transparent glass bell jars (with sealing rubber rings), vacuum pump, electric bell, Hero's engine, balance, fan, balloon and other experimental devices ③ Interactive devices: colored luminous micro buttons (to start the vacuum pump), pressure gauge (to display vacuum degree) ④ Instruction plate, graphic panel: acrylic UV printing (including experimental principles and operation guide) ⑤ Electrical control box: cold-rolled sheet metal with baked paint, vacuum pump drive power supply, short-circuit protection components ⑥ Electrical control box: cold-rolled sheet metal with baked paint, containing control circuits, switching power supply, circuit breakers, terminal blocks, etc. 2. Main Configuration ① Electrical control system: electrical logic control system, equipped with Inertia® K1 PLC controller with protection specially for science exhibits ② Power device: vacuum pump (for evacuation), pressure gauge (for vacuum degree monitoring) ③ Drive device: HF-PANDA vacuum pump drive module, experiment switching components 3. Layout Requirements ① Energy requirement: AC100-240V, 50/60Hz/50～60Hz 400W (standard three-wire socket, reliably grounded, to power the vacuum pump) ② Installation method: direct placement (fixed to the wall with expansion screws to ensure stability) ③ Entry passage: door frame size (width×height) ≥1.9m×2.2m, continuous turning interval ≥2m ④ Maintenance passage: not required
★Exhibit Content: Interactive science popularization experience of physical principles such as sound propagation medium, relationship between air pressure and volume, weight of air, reaction force, and no wind in vacuum ★Interaction: Electromechanical interaction ★Operation: After pressing the button, the bell jar is evacuated, and visitors observe the changes inside the bell jar. ★Exhibit Description: The main body of the exhibit is a transparent vacuum bell jar, inside which five sets of experimental devices are placed simultaneously: electric bell, Hero's engine, air balance, fan and cloth strips, pre-inflated balloon. Visitors operate the corresponding buttons on the control panel to start the vacuum pump to extract air from the bell jar, and observe the synchronous changes of the five devices under vacuum, intuitively understanding the physical principles such as sound propagation medium, relationship between air pressure and volume, weight of air, reaction force, and no wind in vacuum. ★Scientific Principle: 1 Can we hear sound without air: Sound propagates through media such as air. In a vacuum, there is no air as a transmission medium. Although the hammer of the electric bell is still striking the bell, we cannot hear the sound. 2 Hero's engine: During the evacuation process, the air inside the sphere needs to balance with the bell jar, so it sprays out from the thin tubes at both ends. Under the action of reaction force, the sphere rotates. 3 Weight of air: There are two bottles at both ends of the balance inside the bell jar, one sealed and one open, and the balance is leveled with weights. After the bell jar is evacuated, because the air in the open bottle is also extracted, the balance tilts. 4 No wind in vacuum: In a vacuum environment, the rotation of the fan cannot stir the air, so it cannot blow the cloth strips in front. 5 Why does a deflated balloon inflate again: After the bell jar is evacuated, the air pressure decreases. The air inside the originally deflated balloon cannot escape, and it exerts outward pressure on the balloon wall, causing the balloon to expand.
Review
Principle Display: ★★★★ Interaction Effect: ★★★ Ease of Installation: ★★★★ Durability: ★★★ Overall Rating: ★★★