All Questions
30 questions
1
vote
6
answers
141
views
Brilliant's question on air pressure
I have always thought that as temperature increases the pressure does as well in an ideal gas, of course I know the air in the atmosphere isn't exactly an ideal gas but I would've thought that the ...
- 85
0
votes
0
answers
35
views
Does air gap between enclosed chamber and manometer influence the manometer reading?
We have an enclosed chamber filled with water. From the top of the chamber there is a metallic tube connecting the chamber to a monometer. We increase the pressure of the water inside the chamber buy ...
1
vote
1
answer
90
views
Formula of cooling power of compressed air [closed]
For my blog on Trompe air compressors I am looking into uses that people could have with these compressors if they build one themselves (for big versions see this Ragged Chute Trompe).
One of the uses ...
- 111
1
vote
2
answers
129
views
Would lotion pumps work in a vacuum?
I'm just trying to understand how a lotion pump works. I watched this video and it's explained that it's due to the difference in air pressure.
https://www.youtube.com/watch?v=EJVL5zXIPLA&...
- 415
20
votes
4
answers
10k
views
Does the amount of oxygen in air, actually get lower as you go to higher altitudes?
I have heard that there is less oxygen as you go higher (that's what my teacher told me). A reason that supports that is, as you go to higher altitudes, it becomes more and more difficult to breathe. ...
- 837
0
votes
1
answer
35
views
What actually happening in land breeze?
From childhood we are taught about land breeze and sea breeze , but I always had a doubt.
Look at diagram
Book just say " air above ocean become warm so it rise up creating a low pressure zone ...
1
vote
4
answers
3k
views
Why doesn't a hot air balloon burst even if we keep heating the air in balloon for a long time , shouldn't the air pressure become so high to resist?
I don't get one thing: we say a hot air balloon rises as hot air is less dense than cooler air.
However, if the heat source continues to add heat to the air in the balloon, doesn't the hot air become ...
1
vote
1
answer
859
views
Does a tire deflate more quickly when not in use and why? [closed]
Answers from a google support the obvious; that tires goes flat when not in use, but when you read the answers carefully they allude more to that - yes a tire can still go flat when not used. My ...
1
vote
0
answers
91
views
Vapor Pressure in Heated Pressure Vessel
This question is a bit complex, so thanks in advance for addressing it!
I'm working on a reaction vessel that heats a water solution to 95°C to perform chemical reactions. The design is a ...
- 11
-1
votes
4
answers
322
views
Room Pressure and Tiny Gaps
First of all, how can atmospheric pressure be same in a closed room when it clearly depend on the height of the air column. Compared to atmosphere, the room few metres high so how can air pressure be ...
12
votes
7
answers
22k
views
Why does air pressure decrease with altitude?
I am looking to find the reason: why air pressure decreases with altitude? Has it to do with the fact that gravitational force is less at higher altitude due to the greater distance between the masses?...
- 279
1
vote
0
answers
48
views
Suction cup on car dashboard
I have this suction cup to hold dashcam in car. When I leave car in sun suction fails and camera falls down.
Did camera fall because air got heated under suction and expanded or plastic/rubber ...
- 151
1
vote
4
answers
3k
views
Does an A/C change the pressure of a sealed room?
Since I don't know anything about air conditioners, I thought you might have an answer.
I noticed that when my A/C is on and all the windows and doors are closed it is actually working for a few ...
- 60
3
votes
3
answers
244
views
Heat reduction based on compression
So I was thinking about air conditioner today and how we run air across compressed freon to cool down air but why do we need freon at all why not store just compressed air. My guess is because its ...
- 401
0
votes
1
answer
153
views
Low Air Pressure
Can we create low air pressure artificially in a system to make the wind blow towards the system from the higher normal air pressure in vicinity ?
- 1,453
0
votes
2
answers
470
views
What is Work Done against the Atmosphere [closed]
{Assume it's a Spherical Balloon}
The answer on the book states (7pV), but I'm definitely missing something. I've looked up online on what 'Workdone against atmosphere' means but there is little to ...
user226894
1
vote
1
answer
37
views
Increase Air Speed at outlet
I have a set up that inflates a rubber jacket in order release the metallic rings from underneath it. I am currently having issues with not having enough pressure (force) at the outlet to inflate the ...
- 11
-1
votes
1
answer
40
views
What is a safe mass flow rate
In my machine class, the instructor said that if we use compressed air to clean metal of ourselves then we'll actually get hurt because the pressure is too high.
I am wondering, What is considered a ...
0
votes
2
answers
2k
views
Why is the air in high atmosphere typically colder than on the ground? [duplicate]
The air at 10.000m altitude is mostly a lot colder than at the ground. Even if you are in the desert in temperatures of 40 degrees Celsius, the air above you will be significantly colder (below 0 ...
- 299
4
votes
1
answer
313
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
3
votes
0
answers
93
views
Behaviour of Altimeter at different temperatures
I have realized that the Altimeter of my bike computer (it uses Air Pressure to determine altitude and needs to be calibrated every start) is not consistent at different temperatures.
At the Start ...
- 163
2
votes
3
answers
303
views
How does inhalation work?
In school, we learn that during inhalation, the diaphragm expands, causing air to get sucked into our lungs. You can feel this suction by putting your hand over your mouth while inhaling.
Why is that?...
- 387
2
votes
1
answer
942
views
Can sound frequency create more ideal conditions for fire?
You may have seen the recent story of a device that engineers claim can extinguish flames using sound frequency. An older article loosely explains the theory behind how this works:
Sound travels ...
- 121
0
votes
3
answers
6k
views
If I take a bottle of air into space, and open it, then close it and come back to earth and open it one last time, what would happen?
I was reading this post, but no one seem to go further as to say what would happen if you brought the bottle back to Earth? Another thing I want to know is, what would now be in the bottle?
- 33
1
vote
2
answers
9k
views
Pressure vs Volume Calculation for air [closed]
I have 1 litre of air in a sealed container at atmosphere pressure (approx 15 psi absolute).
I want to reduce pressure in the container by 1 psi ( 14 psi absolute or -1 psig).
If I understand ...
- 111
36
votes
7
answers
10k
views
Is it possible to "cook" pasta at room temperature with low enough pressure?
It is known fact, that boiling point of water decreases by decreasing of pressure. So there is a pressure at which water boils at room temperature.
Would it be possible to cook e.g. pasta at room ...
- 505
0
votes
1
answer
512
views
If a balloon is continuously filled with air and stays at a constant shape and size will there be any empty space in the balloon?
If a container like a balloon but with constant volume is filled, is it possible to pack air molecules so closely together that they don't have any empty space between them? If so, what would this ...
- 1
18
votes
5
answers
64k
views
If I take a bottle of air into space, and open it, where does it go?
It seems to me that space doesn't have any/much air, and if my bottle is full of air, when I open it, where does the air go?
- 939
4
votes
1
answer
295
views
Can i use coils with compressed air to make a superconductor?
What im saying is inside pipes i am going to use compressing so that that in the places with low pressure they cool the superconducotor. is this possible? Can i use this concept to make ...
- 512
13
votes
3
answers
7k
views
Inflating a balloon (expansion resistance)
I am doing a quick calculation on how to calculate the pressure needed to inflate a perfectly spherical balloon to a certain volume, however I have difficulties with the fact that the balloon (rubber) ...
- 333