All Questions
Tagged with everyday-life pressure
20
questions
8
votes
5
answers
4k
views
How does buoyancy work?
I realised, reading another Phys.SE question about balloons moving forwards in an accelerating car that I don't really understand how buoyancy works. Particularly concerning, for a SCUBA diver.
The ...
- 3,100
42
votes
12
answers
122k
views
Does car tire pressure change with weight of car load?
Does tire pressure measured by a meter on tire gauge change with load? (I am not interested in pressure produced by car tires onto the road).
Car spec usually says "inflate to 220kPa normal load, ...
- 522
11
votes
1
answer
816
views
What pressure or tension occurs in a glass jar when I pour boiling water inside?
Sometimes it happens that when you pour a boiling water into a glass jar, it cracks. Since glass is very hard material and resilient to pressure, the tension must be very high. Is it possible to ...
- 3,109
8
votes
3
answers
19k
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Why does deodorant always feel cold?
We all use deodorant and they always feel cold, why is that?
Is it because it is liquid inside the bottle and a gas when it is released?
- 863
2
votes
3
answers
6k
views
Why the pressure of atmosphere doesn't crush you when you e.g. walk outside?
Why the pressure of atmosphere doesn't crush you when you e.g. walk outside? I mean the density of air is $1.26 kg/m^3$, so with $100 km$ above us, it exerts much pressure on you when you walk outside....
- 735
75
votes
5
answers
66k
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Why does a candle blow out when we blow on it? Our breath is 16% oxygen and only 4% CO2
Don't say that a layer of carbon dioxide covers the flame, because our breath has more oxygen than carbon dioxide.
Also, our breath does not extinguish the flame by cooling it as it is itself warmer ...
- 2,326
14
votes
5
answers
26k
views
Why will crushing a partially empty 2-liter bottle keep the soda more fizzy?
One of the curses of 2-liter bottles is that when carbonated beverages are stored in them for long periods (i.e. days between drinks) at least the last liter ends up being flat. However, if after ...
- 381
60
votes
2
answers
6k
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Why does pressure in a thermos increase after shaking up hot water and soap?
Whenever I wash my thermos, I put hot water and then some soap in; then I seal the one end with my hand or use the lid. After shaking it up, if I slowly remove the lid or my hand, it expels a little ...
- 581
4
votes
2
answers
5k
views
Why does the "air" close or open doors?
Assume we have an empty room with two doors on the opposite sides of it. If we open one of the doors, the door on the opposite side automatically closes "harder", and if we close one of the doors the ...
- 676
3
votes
1
answer
7k
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How does a bowl of hot water move by itself?
I think everyone should have seen a bowl of hot water moving by itself on a flat surface such as glass(seems like it is moving by itself but maybe there are some external force applied to it when it ...
2
votes
6
answers
12k
views
Does the pressure inside a tire equal to its average ground pressure?
On one hand, I think they should be equal since the external force and internal force are equal in equilibrium. On the other hand, I don't see anything related between them, the inside pressure is ...
- 855
43
votes
10
answers
5k
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When a cork is pulled out of a wine bottle, why does the inner end often expand more than the outer end?
When I pull a cork out of a wine bottle, it usually expands slightly in circumference. This makes sense: you want the cork to be slightly compressed relative to its natural diameter when it's inside ...
- 48.4k
28
votes
6
answers
56k
views
Why does my door shut faster when the window is open?
I've noticed that if I shut my door when the window is open in a room, the door will tend to shut faster. If I shut the door when the window is closed with a normal force it will not fully close as if ...
- 431
23
votes
4
answers
6k
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Why do bubbles make a sound?
I have an understanding of how bubbles work. They encapsulate air (or other fluids) in a membrane caused by surface tension.
When they pop, there is often a sound. Sound is a type of energy, kinetic ...
- 459
10
votes
2
answers
2k
views
Movie airplanes and suction
Having watched a recent action movie (with zombies in it) I wondered whether the suction from a hole in the airplane's hull would really be able to rip out luggage, persons and even seating benches.
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- 9,169