Air weighs more than nothing

1Mind1Spirit

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And yet, when the air is removed from a vacuum on a scale, the scale shows a decrease in weight.
You mean a vacuum chamber.
The air under the vacuum chamber creates more pressure under it.
Thus, a lifting force.
You do know when air pressure is taken out of a container it's the outside pressure that causes it to be crushed, right?
1 minute video
 
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JudgeRightly

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You mean a vacuum chamber.

I mean a vacuum chamber on a scale.

The air under the vacuum chamber creates more pressure under it.
Thus, a lifting force.

Um, so what about the air ABOVE the chamber? There's more of it. Thus, the downward pressure should be greater, right?

Why does the air below the container exert a greater force than the greater amount of air above the container?

Your claim (because that's all it is) makes no sense.

You do know when air pressure is taken out of a container it's the outside pressure that causes it to be crushed, right?
1 minute video

Yup. And the reason being is that there is a greater pressure surrounding (not just below) the container than there is being exerted on the inside of the container. Notice how the train car doesn't start floating up, but still goes down?

Can you please explain why things go DOWN, and not up, even when they lose mass?
 

1Mind1Spirit

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Um, so what about the air ABOVE the chamber? There's more of it. Thus, the downward pressure should be greater, right?
No, the air molecules under will have more elastic collisions, plus in that so called experiment the air is being sucked up and out. So inside the container there will be more pressure lifting against the top.
 

JudgeRightly

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No, the air molecules under will have more elastic collisions,

There are more molecules having the same elastic collisions above than there are below.

plus in that so called experiment the air is being sucked up and out. So inside the container there will be more pressure lifting against the top.

You seem to have forgotten that a gas exerts pressure evenly against all surfaces of the container it is within. Pulling out the gas means there is less pressure on ALL surfaces, not just in whatever direction the hole is. That's why, whenever you open a bottle of soda, the entire bottle seems to contract, and not just the bottom.
 

JudgeRightly

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Simple, ya can't have air pressure without containment.

Oh really?

So if you boil some water in a kettle, and it starts boiling, and you put a piece of paper or paper towel or tissue over the spout, what happens to it? Does it start to be pushed up? You know, because of the pressure?

Pressure that isn't in a container.... Huh, almost like you CAN have pressure without a container.

Wind and temperature are influencing factors in the cause of pressure gradients.

Wind is the result of temperature and pressure differences in the atmosphere....

Temperature affects how fast atoms move, causing greater or lesser pressure.

There are no significant pressure gradients within a sealed container.

There is NO pressure being exerted on the inside surfaces of a vacuum chamber. That lack of pressure is what causes the train car to implode. It's made for keeping pressure under containment, not withstanding the pressure from external forces.

Every time my furnace kicks on it creates wind, in my outside tank, causing pressure gradients.

But that's not a container, now is it?

I thought you said pressure requires containment. Are you now backtracking?

Again, a gas exerts pressure evenly across all surfaces of the container it is within. You haven't addressed this.
 
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