Here's a Question! - Wet or Dry?
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- Опубліковано 26 бер 2023
- A dry paper towel is wadded up and crammed into the bottom of a plastic cup, where it's held in place with a little piece of tape. The cup is flipped over and lowered into a partly filled aquarium, where it's held underwater for about 30 seconds. When the cup is removed from the water, what's the state of the paper towel?
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#airpressure #divingbell #heresaquestion
Love these weekly videos. Thank you for making them!
Thanks for watching!
That's a pretty great illustration. Thank you!
You're welcome!
Thanks once again.
Always good stuff. Even better with bloopers!
Ahh! Someone watched to the very end!
@@JeffersonLab Who among us has not had experimental apparatus failure and gently exclaimed "... noooo!"?
funny blooper as post-credit-scene :-P
Que bien ... !
This is the same principle used by early forms of diving suits. Air pressure was applied via an umbilical cord, in order to keep the water evacuated from the helmet. The cord had a compressed air line and a communication line in it so that the diver could communicate with the surface crew. The suit was very heavy so the diver would have to be hoisted out of the water when the dive was completed. If the umbilical cord was cut, the diver could drown.
Submerging it long enough would increase the humidity of the trapped air. In turn, the paper is exposed to this higher humidity making it wetter than before ever so slightly. Or am I missing something?!
Well... this was recorded in costal Virginia during the summer. The ambient humidity level isn't that much different than what you are describing.
Dry!
I decided to guess the most unlikely scenario I could think of...
E. It bursts into flame halfway through the experiment.
Meh, it was worth a shot! 😏
Actually - that's a possibility. If the cup were to be lowered into the water very quickly (and fairly deeply), the air would be compressed to a point where it would be hot enough to ignite the paper towel.
@@JeffersonLab A curious notion... It makes me wonder just how fast it would have to descend through water to get that rapid a compression, and what sort of container could survive it. 🤔
🤔 It kinda brings up a philosophical question. If an object is UNDER water, is it wet? Or, is it only wet right when it's removed from the water. It's not a lame question. When swimming under water we don't necessarily have the sensation of being wet til we get out of the water.
If a dolphin had human intellect and you asked him if he's wet, he probably wouldn't be able to comprehend the question.
I'd like your take on this.
Would the dolphin have ever experienced dry? Does sticking its head above water count as being dry? Anyway, my gut reaction is, yes, an object under water is wet. I get what you're saying about not really feeling wet when under water. But, if I'm dry, I can't drown. And I can certainly drown if I'm under water.
@@JeffersonLab
Thanks for the kind response. You're probably correct. Here's another. If you take a spring, like a coil spring from a car, and you compress it. It has stored energy. If you dissolve it in acid, where does that compressed energy go?
I'm assuming the spring doesn't fail at a weak spot and go 'sproing' in the acid? Something more like a nice, prefect, uniform dissolution? It'll end up as thermal energy in the acid. Each atom is under some amount of stress. When an atom is freed from the spring, the release of this stress would 'fling' the atom into the acid. Basically, the stored potential energy would be released as kinetic energy in the dissolving atoms which would eventually show up as an increase in the temperature of the acid.
@@JeffersonLab
Thank you! I figured heat had something to do with it but I couldn't understand the "mechanics" at the molecular level. Now it makes sense. Thx again.
I subscribed and if I come up with others I'll let you know. Use them in some of your videos if you want.
😊