All Questions
Tagged with everyday-life pressure
101
questions
0
votes
3
answers
5k
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How does liquid stay in a Pasteur pipette/eye dropper instead of dripping out?
From what I understand about how pipettes work (correct me if I am wrong), when you squeeze the bulb of a pipette, you are removing the air from it and when you dip the end in liquid and release the ...
- 147
1
vote
1
answer
6k
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Why did my bag of chips expanded in airplane and didn't get back to normal after landing?
I bought a usual bag of chips and took the plane. In the air, it seemed that it was pretty much expanded, as if it was going to explode.
I thought to myself: ok that's normal, the pressure in the ...
- 193
5
votes
3
answers
27k
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Opening tight bottles
Why do so many people recommend patting/hitting on the lid of bottles, or alternatively on the bottom, in order to open them when they are too tight? Is it even effective? And why would it work?
- 637
1
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0
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194
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Looking for equation that explains empiric data of tire pressure change due to load
I did some measurements on how tire pressure changes due to different loads in a car.
There are still some open questions I can't seem to solve on my own, even though I could already use parts of ...
- 11
2
votes
1
answer
261
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why does the temperature of spray cans always feel cooler than the temperature of the environment? [duplicate]
I know why sprayed gas is cooler due to evaporation thru different pressures, but I can't understand why is the can temperature always lower than environment?
8
votes
5
answers
11k
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Why does it seem as if big vehicles "attract" mine when I drive close to them?
When I drive a car at high speed and when I am near to another big car (like a van, or transport vehicle) I feel an attraction to or something push me toward the other big car. What's the physics in ...
- 109
0
votes
0
answers
31
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Loud, low-frequency "booming" sound in car [duplicate]
I drive a Scion XD, and I've noticed that whenever I drive at about 40mi/hr or so with just the back windows rolled down, I get a loud "booming" effect at roughly 10Hz. What causes this? I assume it ...
- 161
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 ...
4
votes
4
answers
1k
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Why is the required tire pressure inversely proportional to the volume/size of the tire?
I once noticed a tire pressure table on a farm recommended a tire pressure of around 1.0 bar (I don't remember the exact number, but it was definitely below 1.9) for the rear tire of farm tractors.
...
- 385
5
votes
2
answers
6k
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How does train back draft work
Quoting platforms and stations :
Fast trains can create a vacuum called a ‘back draft’ that can blow you over or suck you under a train.
How does that work ? I thought that the volume of air ...
- 153
3
votes
1
answer
5k
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Why is water vapor released when an empty water bottle is squeezed?
I recently came across this tutorial and wondered why vapor will come out when the cap comes off. Heres the Tutorial
- 757
42
votes
12
answers
122k
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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
0
votes
4
answers
4k
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Breathing Air Underwater From A Car Tyre
I've seen in many movies and programs the event where a car plummets off the road and in to a body of water, sinking rapidly. The car slowly fills with water as it sinks and the occupant(s) don't ...
- 125
5
votes
1
answer
2k
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Why do some pressure cookers initially leak
Why do some pressure cookers initially leak steam from the sides and after a while settle down and don't leak? Is it a positive feedback mechanism from the building steam which makes the sealing ...
- 199
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