Tagged Questions
1
vote
2answers
179 views
Is it possible to calculate atmospheric pressure if given temperature (F) and elevation?
I am working on a report at work and need to determine the atmospheric pressure for small intervals over a 24 hour period. Searching Google, I've found charts which give a base pressure of 14.65 psia ...
1
vote
2answers
122 views
Height of the atmosphere - conflicting answers
Okay. I have two ways of working out the height of the atmosphere from pressure, and they give different answers. Could someone please explain which one is wrong and why? (assuming the density is ...
2
votes
2answers
108 views
If I lift a submerged hose over 35 feet above the water's surface, what's in the top foot?
I've been arguing with a friend about the whole "perfect vacuum" concept. He and I agree that the most powerful vacuum pump in the world couldn't pump water more than ~34 feet above the surface of a ...
0
votes
2answers
640 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 ...
-2
votes
1answer
184 views
For how long can we make an air balloon stay flying via remotely controlled heat system?
I wonder how a function $$f=f(h, m_{\mathrm empty}, V_{max}, T_{h}), $$ with the top height $h$, the empty mass $m$, the maximum volume $V_{max}$, and the temperature of the heater $T_{h}$ would look ...
5
votes
2answers
193 views
Keeping air in a giant gravitationally-bound space balloon
Let's say a space-faring society wants to make a space station that has a large volume filled with air (or other gas), but no gravity. Using normal pressure tanks will require gathering an amount of ...
1
vote
2answers
237 views
Atmospheric pressure inside a rigid vessel
On a macroscopic scale one can explain the atmospheric pressure by the weight of the column of air over a given small area.
If you enclose this air in rigid vessel (for example by pressing together ...
2
votes
2answers
1k views
Pressure at a given altitude?
I am trying to find out the pressure at a given altitude but have been disappointed to find the following equation does not work at all: (h = height in meters)
Where
sea level standard ...
0
votes
1answer
173 views
what is the relationship of sound volume to atmospheric pressure?
what is the relationship of sound volume to atmospheric pressure? if I was in a plane with a cabin pressure equal to 8000 feet would the volume drop be noticable?
5
votes
5answers
631 views
What would ACTUALLY happen to a person jettisoned into space?
[insert obligatory statement of my lack of knowledge in physics]
Alright, so we have all seen the movies where someone gets blasted out of the airlock on their starship, or their suit decompresses ...
9
votes
4answers
2k views
Why can't CO2 mix back with the liquid after a soda bottle has been shaken?
If you shake a soda bottle before opening it, and then open it, you get the fizz.
That is the compressed CO2 releasing to the atmosphere which is at comparatively low pressure value.
Two questions ...
0
votes
2answers
407 views
Would weighing scales show a negative weight if placed in a vacuum?
The weighing scales in my kitchen are currently showing 0 Kg. However, there is a column of air between the scales and the ceiling that is presumably exerting pressure on them. If I were to place ...
