All Questions
Tagged with everyday-life pressure
101
questions
3
votes
2
answers
324
views
Why is it hard to feel sound pressure from higher frequencies?
Reading the Wikipedia page on pressure magnitudes,
https://en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)
I was surprised to see that the threshold for pain (140db) is listed as ±200 Pa of ...
- 33
179
votes
2
answers
19k
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When separating an Oreo cookie, why does the cream stick to just one side only?
There is probably some reason for this, but I can't figure out what it is. I agree that it probably doesn't happen 100% of the time, but most all of the time, the cream is clinging to just one of the ...
- 2,637
1
vote
2
answers
597
views
Why does a sheet of paper stick to the end of a vacuum cleaner?
What makes a piece of paper or other material hard to pull away from the end of a vacuum cleaner once it's covering the opening? What force are you acting against when you try to pull it away? Also, ...
- 113
1
vote
2
answers
7k
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Why plastic covers on containers are compressed when microwaved?
These situations happen a lot around me since I always bring my lunch to the school. It is not just plastic warp, but my plastic container lid too. Unlike Why does plastic wrap grow, then shrink, then ...
- 179
1
vote
0
answers
406
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Is it possible to breathe deep underwater with a pipe if enclosed in a box?
A problem in the physics textbook I was using asked how deep someone could go underwater and still manage to breath through a strong pipe or hose, assuming that the maximum pressure difference the ...
- 127
1
vote
2
answers
220
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Thought Experiment: If you fell out of a plane at 36,000 ft (11km), would the additional air pressure from falling allow you to breathe?
Imagine you fell out of a plane at 36,000 ft (11km), roughly cruising altitude, with a parachute. If you deployed your parachute immediately, you would be stuck at high altitude with no oxygen, and ...
- 2,714
4
votes
4
answers
876
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Is it easier to uncrush a water bottle full of air or water?
Say I had a plastic water bottle that was slightly crushed, I could uncrush it (mostly) by covering the opening with my mouth and blowing air into it hard.
Would it be easier to do this if the bottle ...
- 973
0
votes
2
answers
1k
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Why pressure cooker is more effective in cooking than any vessel?
Why do we prefer cooking/boiling food in pressure cooker, I know there is a reason but don't know what is it?
I can't show my work here as it is a conceptual question.
- 1,829
0
votes
1
answer
2k
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Why is it sometimes hard to open the jar?
The thing that all of us have experienced is about some stubborn jars!
Does anyone know what's the reason?I think it might be related to air pressure but I don't know how to explain it!
Edit:
Right I ...
- 121
4
votes
1
answer
309
views
Is there an ideal proportion for water to air in an espresso machine?
Let's imagine a very simplified espresso machine, and let's ignore the pump etc. and focus simply on the boiler. This is a metallic cylinder containing water, with a heater at the bottom, and a pipe ...
- 787
2
votes
0
answers
467
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Apartment house ventilation: will adding supply air solve tobacco smell problem? [closed]
For at least two years our life quality has been significantly reduced because our upstairs neighbor is a chain smoker and the smell is coming down to our apartment through ceiling structures. I've ...
- 29
4
votes
1
answer
1k
views
Does the force on the bottom piece of a hummingbird feeder depend on the height of the water in the reservoir?
Intuitively I would think that the more nectar you put into the reservoir the more weight it will put on the bottom piece (the tray that holds the open pool of nectar that the birds can feed out of). ...
- 2,613
3
votes
1
answer
11k
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Raising a cut on your arm above your heart
I often read that when you have a deep cut on your arm, you should raise your arm to the point where the cut is above your heart. This should reduce the amount of blood loss because less blood reaches ...
- 2,943
3
votes
1
answer
7k
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If my windows are open on a windy day, the curtains sway and the doors slam shut. Why don't I feel this wind?
I am standing indoors, right in front of my open window, as I see my curtains moving back and forth and I can hear my closed doors shaking. I can also hear the wind howling loudly.
Why don't I feel ...
- 133
3
votes
2
answers
1k
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Are low pressure and high pressure areas responsible for rain?
My understanding is that low pressure areas are susceptible to rain. However, high pressure areas have no rain. Now, I want to correlate this with the following areas -
Lower Hutt, Wellington , NZ - ...
- 157