Entertaining physics
A few days ago I was telling in my LiveJournal about the observation that I made after the flight from Philadelphia to Colorado: at an altitude of 3000 meters, all the tubes that I had with me, when I tried to open them, began to spit their contents.
I decided that it was time to finally apply the knowledge gained at the institute (the diploma of an engineer-physicist in the closet) and tell you, dear readers, about the reasons for this mysterious phenomenon.
Here is a quote from the previous issue of entertaining physics:
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“The point is the difference in pressure. The smaller the height at which you are, the higher the column of air that presses on you from above.
Normally, the pressure in an open tube is automatically aligned with the pressure outside. If this were not the case, the tube would be flattened out, if the pressure inside was below atmospheric pressure, or, on the contrary, it would explode if the internal pressure was higher.
When I, after brushing my teeth at home, tightly closed the tube, the pressure was preserved in it. After 10 hours, I opened it in a hotel at a three-kilometer height (the air column pressing on us with a tube was exactly 3000 m shorter). The tube took a deep breath, giving away all the excess, the pressure inside and outside leveled off, and I was doused with paste. ”
When I was going back home, I decided to conduct an experiment: does the tube flatten during the return flight?
What will happen if the tube is tightly closed at an altitude of 3000 m and quickly transport them to a height close to zero?
Here are the results:
To make it easier to compare, here is a tube, photographed at intervals of 10 hours: before and after the move.
Closing tubes at a height of three kilometers, I canned down mountain pressure inside them, which is lower than normal. Normal pressure on my return tubes simply flattened.
PS The most interesting thing is that after the flight, I recovered to the full charge of the dead battery in the camera. Who has any idea why this could happen?
I decided that it was time to finally apply the knowledge gained at the institute (the diploma of an engineer-physicist in the closet) and tell you, dear readers, about the reasons for this mysterious phenomenon.
Here is a quote from the previous issue of entertaining physics:
')
“The point is the difference in pressure. The smaller the height at which you are, the higher the column of air that presses on you from above.
Normally, the pressure in an open tube is automatically aligned with the pressure outside. If this were not the case, the tube would be flattened out, if the pressure inside was below atmospheric pressure, or, on the contrary, it would explode if the internal pressure was higher.
When I, after brushing my teeth at home, tightly closed the tube, the pressure was preserved in it. After 10 hours, I opened it in a hotel at a three-kilometer height (the air column pressing on us with a tube was exactly 3000 m shorter). The tube took a deep breath, giving away all the excess, the pressure inside and outside leveled off, and I was doused with paste. ”
When I was going back home, I decided to conduct an experiment: does the tube flatten during the return flight?
What will happen if the tube is tightly closed at an altitude of 3000 m and quickly transport them to a height close to zero?
Here are the results:
To make it easier to compare, here is a tube, photographed at intervals of 10 hours: before and after the move.
Closing tubes at a height of three kilometers, I canned down mountain pressure inside them, which is lower than normal. Normal pressure on my return tubes simply flattened.
PS The most interesting thing is that after the flight, I recovered to the full charge of the dead battery in the camera. Who has any idea why this could happen?
Source: https://habr.com/ru/post/57551/
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