- #1
royp
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- TL;DR Summary
- Experiment of Magdeburg hemispheres demonstrates the 'strength' of the air pressure. When the air was pumped out of the sealed sphere, the sphere contained a vacuum (mostly). and could not be pulled apart by teams of horses. This thread is to discuss how to set the 'empty' sphere in motion by air propulsion.
This is about the famous, classic experiment of Magdeburg hemispheres with the Wikipedia link below:
https://en.wikipedia.org/wiki/Magdeburg_hemispheres.
"The experiment was designed to demonstrate the vacuum pump invented by Otto von Guericke - but also the tremendous 'strength' of the atmospheric pressure. In the experiment, when the air was pumped out of the sealed sphere, the sphere contained a vacuum (mostly) and could not be pulled apart by teams of horses."
My topic goes further from here. After the horses failed and got tired, let the sphere be detached and placed in front of me, stationary. Clearly, though the sphere contains vacuum inside and there are pressure differences between inside and outside of the sphere, it does not move as there are balancing air pressures on the left and right hemispheres - from outside. Now, I attach a propeller (with a power source - battery) to the right hemisphere and the entire system is placed and firmly attached on a wheeled platform. Now, when the propeller starts to rotate and push the 'air' in front, forward - the entire system will be set in motion; moving to my right. This is because there are now more pressure on the left hemisphere than on the right hemisphere.
Is my understanding correct? Please let me know. I have few more questions on this but I want to ask those later.
https://en.wikipedia.org/wiki/Magdeburg_hemispheres.
"The experiment was designed to demonstrate the vacuum pump invented by Otto von Guericke - but also the tremendous 'strength' of the atmospheric pressure. In the experiment, when the air was pumped out of the sealed sphere, the sphere contained a vacuum (mostly) and could not be pulled apart by teams of horses."
My topic goes further from here. After the horses failed and got tired, let the sphere be detached and placed in front of me, stationary. Clearly, though the sphere contains vacuum inside and there are pressure differences between inside and outside of the sphere, it does not move as there are balancing air pressures on the left and right hemispheres - from outside. Now, I attach a propeller (with a power source - battery) to the right hemisphere and the entire system is placed and firmly attached on a wheeled platform. Now, when the propeller starts to rotate and push the 'air' in front, forward - the entire system will be set in motion; moving to my right. This is because there are now more pressure on the left hemisphere than on the right hemisphere.
Is my understanding correct? Please let me know. I have few more questions on this but I want to ask those later.