# Negative pressure from vacuum to shunt a object upwards?

• nightsdawnfan
In summary, Nightsdawnfan thinks about aeronautics and physics in order to come up with ideas for cheaper and more efficient ways to transport food and water. He has an idea for a vacuum airship that uses negative pressure to stay up. He also has an idea for a principle of negative pressure that he thinks could be useful in the future.
nightsdawnfan
Hi folks,
I think a lot about aeronautics and physics for the purposes of helping people. I stumbled across the idea of vacuum airships as a cheap method of transporting food and water to places where it's unsafe for vehicles, or where there are no roads. We all know it's unconventional and uneconomical to sustain a vacuum -- carbon fiber and specialized materials are expensive even if you have a working design. My next idea is the principle of negative pressure. For thought, just imagine a tall cylindrical body with two parts to it. The bottom is the place where you put things and the bottom face is wider than the top. The top is empty with walls thick enough to handle rapid changes in pressure and covered with a lid. The top portion is a envelope with vacuum. The whole thing is beaker shaped. Next, imagine this setup is lifted onto a crane above the ground to rest. At this point, "with the snap of a finger" let's make the lid disappear.

What would happen?
A) The rig is shunted upwards due to the negative pressure due to a momentary upward force.
* Atmosphere above fills the void
* Atmosphere underneath (at a higher pressure because it's lower relatively) pushes up to fill the void
* Rig experiences a net force upward force due to the negative pressure
* Newtons law allows the net up force because the higher pressure of air below relative to the void.

B) The rig just shakes up and down briefly
* The atmosphere above collapses on the void equal to the atmosphere below
* Result is no net up force even including for the momentary buoyant force

Thanks
Nightsdawnfan

Last edited:
nightsdawnfan and OmCheeto
I will work on one, will try for a post later tonight.
Thanks
Nightsdawnfan

## 1. How does negative pressure from a vacuum shunt an object upwards?

Negative pressure from a vacuum creates a suction force that pulls the object upwards. This is because the vacuum creates a low pressure area above the object, causing the higher pressure air below the object to push it upwards.

## 2. Can any object be shunted upwards using negative pressure from a vacuum?

Yes, as long as the object is not too heavy and the vacuum has enough suction force, any object can be shunted upwards using negative pressure from a vacuum.

## 3. Is there a limit to how high an object can be shunted using negative pressure from a vacuum?

Yes, there is a limit to how high an object can be shunted using negative pressure from a vacuum. This is because as the object goes higher, the pressure difference between the top and bottom decreases, reducing the suction force.

## 4. Are there any risks or dangers associated with using negative pressure from a vacuum to shunt objects upwards?

Yes, there can be risks and dangers associated with using negative pressure from a vacuum to shunt objects upwards. If the vacuum is too strong, it can cause damage to the object or even cause it to break. It is important to use caution and appropriate safety measures when using this method.

## 5. Are there any real-life applications for using negative pressure from a vacuum to shunt objects upwards?

Yes, there are several real-life applications for using negative pressure from a vacuum to shunt objects upwards. One example is in pneumatic tube systems, where negative pressure is used to transport small objects through a tube system. Another example is in vacuum lifters, which use negative pressure to lift and move heavy objects.

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