Hand inside vacuum chamber experiment - GIF

Hand inside vacuum chamber experiment.

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Previously:

https://www.homemadetools.net/forum/...015#post160566
https://www.homemadetools.net/forum/...478#post196936
https://www.homemadetools.net/forum/...070#post138031
https://www.homemadetools.net/forum/...745#post193978
https://www.homemadetools.net/forum/...748#post193998

Wow. I hope nobody asks him what would happen if he put his head in a vacuum chamber.

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Originally Posted by schuylergrace

Wow. I hope nobody asks him what would happen if he put his head in a vacuum chamber.

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His name is James Orgill and he has a PhD in chemical engineering. His voice is annoying as hell, but he's super smart and his Youtube channel is top shelf.

https://www.youtube.com/c/TheActionLab/featured

I think a hand operated vacuum pump is one of the devices used to assist sufferers of erectile dysfunction. Just in case you want to know!

I clicked over to his channel and realized I have seen a couple of his videos. Still, degrees notwithstanding, I would not have done that to the point he seemed to. I don't know how much vacuum he pulled, but I was envisioning tiny embolisms all through his hand and forearm. I just watched the video this GIF came from, and I'm still not convinced it was a good idea.

Quote:

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Originally Posted by nova_robotics

His name is James Orgill and he has a PhD in chemical engineering. His voice is annoying as hell, but he's super smart and his Youtube channel is top shelf.

https://www.youtube.com/c/TheActionLab/featured

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Many of the older generation people would have learned about the hazards of having your body subjected to both negative and positive pressures during science classes in school, through the demonstrations of placing objects such as grapes apples bananas or small cuts of meat in clear chambers then have the air pumped out or the pressure increased, while the teacher explained what was happening to the objects as they were going through the transformations.
I remember seeing such demonstrations in my earlier years in schools maybe in grade 5,6 or 7 and for sure in science and chemistry lab in high school. However, I was in school back during the Mercury, Gemini and Appolo era.
I highly suspect the practice of classroom demonstrations such as these may have fallen out of the educational curriculum for later generations.

Notwithstanding the very real risk of Compartment Syndrome.

http://en.m.wikipedia.org/wiki/Compartment_syndrome

I also have a problem with him and others calling such things "experiments." They aren't experiments, but demonstrations. We know what is going to happen--well, some of us do, and the rest could just look it up. An experiment implies the answer isn't known or hasn't been confirmed (as in checking another's work for repeatability). But anything you do on the Interwebs that's outrageous and science-y is an "experiment" these days.

Totally agree that this is a demonstration and not an experiment. I still find it amazing though that we can dive down many atmospheric multiples easily and safely, but remove that one tiny atmosphere and we basically become a balloon.

I remember many years ago talking to G. Harry Stine (author, etc.) about a skin suit that was NOT airtight. Seems as long as you support the skin with something like a compression sock it can handle vacuum.

I don't know if that research went anywhere, haven't heard about it in a long time and Harry died in 1997.

My 7th grade science teacher taught us the rule about "Add Acid To Water" quite graphically. He had a large Pyrex beaker (5 or 6 liter) with about a liter of Sulfuric Acid into which he poured about 250ml of water. The contents immediately started boiling vigorously. He took the beaker to the back of the class and stuck it in the big heavy sink, then came back up front and started talking about more of the subject. At the end of the class he said "I want to show you something"

He went back and picked up the beaker.

Still steaming .

That firmly fixed that rule in my head!

Quote:

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Originally Posted by bruce.desertrat

My 7th grade science teacher taught us the rule about "Add Acid To Water" quite graphically. He had a large Pyrex beaker (5 or 6 liter) with about a liter of Sulfuric Acid into which he poured about 250ml of water. The contents immediately started boiling vigorously. He took the beaker to the back of the class and stuck it in the big heavy sink, then came back up front and started talking about more of the subject. At the end of the class he said "I want to show you something"

He went back and picked up the beaker.

Still steaming .

That firmly fixed that rule in my head!

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The mnemonic helps me to remember

Add acid to water
Like a fellow oughter

Unfortunately, so many of these hands on real life demonstrations have been removed from the class rooms these days. It was the explosions, smoke and electrical arcs that kept my attention and got me thinking. I am so thankful I had teachers that were able/allowed to do those kinds of demonstrations back then. There is a huge difference between watching a video and seeing it first hand. Kids these days are missing out.

As to the original video and body experiments (though that video was a demonstration) - I remember when Col. (at the time) John Stapp came and spoke at our school. He was the first man to ride a rocket sled out at Holloman AFB. This is a man that gave his body for science, experiencing more than 40g's to help advance ejection seat technology. https://www.popsci.com/blog-network/...cket-sled-man/

Quote:

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Originally Posted by odd one

Unfortunately, so many of these hands on real life demonstrations have been removed from the class rooms these days. It was the explosions, smoke and electrical arcs that kept my attention and got me thinking. I am so thankful I had teachers that were able/allowed to do those kinds of demonstrations back then. There is a huge difference between watching a video and seeing it first hand. Kids these days are missing out.

As to the original video and body experiments (though that video was a demonstration) - I remember when Col. (at the time) John Stapp came and spoke at our school. He was the first man to ride a rocket sled out at Holloman AFB. This is a man that gave his body for science, experiencing more than 40g's to help advance ejection seat technology. https://www.popsci.com/blog-network/...cket-sled-man/

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That reminds me of another demonstration in the same class, this time by a school resource firefighter, showing us the dangers of screwing around with gasoline. He had a steel container (from my dim memory of 7th grade) roughly the size of a insulated coffee cup. He pulled out a eye dropper, put one drop of gasoline, covered it and shook it up. Pulled off the cover and dropped a match in window-rattlin BANG!

This is much the same way our welding shop teacher taught us the difference between oxy, acetlylene and oxy-acetylene.

Filled a baloon up with oxy, touched it with a hot welding rod: POP!
Filled one up with Acetylene, touched it : FOOMP. Big yellow fireball, acetylene soot floating everywhere.
Filled one up with Ocy-Acetylene, then told us to pay close attention so we cold tell the difference...

He gave us a few minutes to regain our hearing and told us "THIS IS NOT SOMETHING TO PLAY AROUND WITH!"

(other lessons, like absently picking up a no-longer-red-hot piece of steel I'd been working on in the forge with my bare hand, because 16YO brain said "It's not red anymore, so it's not hot" he left for us to discover on our own... :lol: )

Quote:

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Originally Posted by jdurand

I remember many years ago talking to G. Harry Stine (author, etc.) about a skin suit that was NOT airtight. Seems as long as you support the skin with something like a compression sock it can handle vacuum.

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This is an active area of research. The magic search keyword is "Mechanical counterpressure suit". Here's the state of the art as of ~2017.
Attachment 42026

The problem with them is they have to be super snug. That makes them a serious pain to put on. If your suit fits too loose anywhere where they aren't tight enough, you get a big Hickey. Mr. Jar guy above is an extreme case of that. He got the arm Hickey and, since there was no support preventing the jar from moving up, the Earth's atmosphere tried to squeeze his entire body into that jar like squeezing a tube of toothpaste. The only thing preventing that from happening (or more of his arm getting sucked in) was his (rather fragile) arm and wrist bones.

So they were on to something with the uniforms in Star Trek the Next Generation!

They were on something all right. Imagine being a starship mechanic and not having pockets. I'd literally die. In that case I mean literally in the literal sense. Someone would shove me out an airlock the 500th time I misplaced the little widget that realigns isolinear chips.