Vacuum question!

We be vermin. We can test anything (it's kind of like the underpants gnomes, only different). We tested... Instantaneous gasification. No blobs of water. It sucked.

The water blob thing occurs only when you have zero Gs and an atmosphere - like in the space shuttle.

Don't tell me... You're a bureaucrat, right?

Is it possible to get the thing done practically and see for ourself and share. rather han glass sphre we can experiment with cloth or something else ball and take out the air by a vacuum pump and insert in water and tear/break it.

Yes! let's set fire to a japatti!!!

1. It shall be float on water, even there is no a vacuum.

2. The free space inside will still exist, because you can restore it at any time you need, it is a filled space.

So does a vacuum cleaner use a vacuum to clean or can I use it to clean up my vacuum chamber?

This question has continued to bedevil me in spite of the long time since it was posted. So, after I got a chance to do the experiment, I decided to post the answer.

I came across a cache of vacuum tubes yesterday and bought a couple. I ran the experiment by fastening a tube to the bottom of a large container filled with water to about 10 cm above the top surface of the tube. I then used a sharpened metal rod to break the tube. These were the results as best I could observe them:

The water rushed into the tube before the entire glass envelope could fall away.

There was a froth of small bubbles (<0.5 mm diameter) which either flowed into the tube at the break initiation site or else formed in the water that had just entered. The froth was no more than 1 cc in volume and quickly dissipated.

There was no visible disturbance of the surface. There was no noticeable refractive change in the water above the tube.

Conclusion: It is as Vermin said.

some vacuum tubes contain some argon or other inert gas. I was told once that these gases prevent the premature pitting of the cathode, which would slowly turn to gas through sublimation, coating the inside of the tube (that's why an old vacuum tube will look smoky on the inside and they sometimes turn completely black or silvery before the tube fails). So if there were bubbles not caused by cavitation, they may have been argon. Cavitation is what happens when water is exposed to a near perfect vacuum--bubbles appear in the water, but they aren't air bubbles or steam. They are empty space with, probably, a trace of water vapor in them. Within a fraction of a second, the bubbles go out of existence as the pressure on the water around them returns to normal. Thunder is what happens when air is split by a lightning bolt, causing a cloud-high column of vacuum which closes instantly, violently, and noisily. Cavitation doesn't make thunder because the vacuum bubbles are so small, but they do make a distinctive hissing sound like bacon frying. This sound makes it easy to track a ship or submarine and since every screw is different, the sound can be differentiated and identified down to a single craft by a computer or a very good sonar man. Submarine screws are designed not to cavitate--they lose a bit of efficiency by allowing the water to come back together gently at the trailing edge of the screw, but by keeping the screw speed under a certain RPM and machining the trailing edge so that a bare minimum of thrust is exerted in that region, you can run silent while you run deep. A vacuum tube that is lighter than the water it displaces will float. Almost anything is lighter than the water it displaces. Even rocks are lighter underwater. Glass is just a little bit heavier than the water it displaces, so the vacuum tube could even be mostly filled with water and it probably would still float. Air weighs a certain amount. Argon weighs a bit more. Vacuum, since it is nothing at all, weighs least of all. So a glass tube full of argon would float a little lower in the water than a tube full of air, and a tube full of vacuum would float highest in the water of all. If you could somehow fill a balloon with vacuum and have it maintain its balloonlike shape, it would float in the air--it would be lighter than a balloon filled with helium or hydrogen.

If you could somehow fill a balloon with vacuum and have it maintain its balloonlike shape, it would float in the air--it would be lighter than a balloon filled with helium or hydrogen.

I've fantasized about this idea as a kid. Many others have thought of it to ...

http://www.halfbakery.com/idea/Balluum