Atmosphere Definition and 396 Threads

As the title suggests, it just occurred to me that things don't burn up when entering the ocean as opposed to when entering the atmosphere. This seems counterintuitive because the explanation behind atmospheric burnup is usually attributed to friction. In that case, water should provide even...

"Due to atmospheric refraction the position of Sun in the sky is different from its actual position." But why doesn't Sun look like a rainbow in that case? Different wavelength should follow different paths in atmosphere - no? Why Venus does not look like a sequence of colours perpendicular...

TL;DR Summary: what kinds of gasses can be in the atmosphere of a planet without killing them or not being naturally possible I have been creating a fictional star system and ran into an issue, most of the planets atmospheres are not all the interesting, feels wrong to have most be oxygen...

https://www.esa.int/Space_Safety/Planetary_Defence/Asteroid_2024_RW1_impact_ESA_analysis How it is reported in the media - https://www.atlasobscura.com/articles/luzon-asteroid-2024-rw1 https://www.space.com/asteroid-earth-impact-september-2024-rw1...

If the surface is heated, air above it will also heat, its temperature will rise. It will cause two processes: while temperature of gas rise, its pressure will also increase, but, also, as the air molecules get more energy, they will go higher from the earh surface, concentartion of the...

Read Venus stats for first time yesterday. Could the spin rate at accretion time reduce Earth's atmosphere relative to Venus, or are there moon tidal effects, e.g. mixing and carrying heat to upper atmosphere allowing escape velocity losses, to explain the 100 fold difference? I have heard...

This is a climate change calculation question. AGW (Anthropocentric Global Warming) theory states that as a gas gets more dense, the height at which it will release IR (Infrared Radiation) to outer space gets higher. Higher in the Atmosphere is cooler. Cooler means a lower IR output. Reduced...

im learning thermodynamics and currently in a lesson about thermal processes. one process has constant pressure and before diving into equations or any proof the book provides a figure of a gas cylinder. the cylinder has a movable piston/lid on one side. the book then says "...and the piston end...

I work as part of the engineering team running an incinerator. When the ash is removed from our furnace, it creates an open system between the furnace (which is close to being a vacuum) and the atmosphere. For many reasons, this is not ideal. We are looking to add a second door to this ash...

Does it mean that the atmosphere is made of the same atoms and molecules like our atmosphere and that it has the same spheres such as trophosphere? And that the temperatures in these spheres are also the same or very similar like here? And are distances between these spheres the same like here...

Attempt : 1. Pressure at height ##z## : ##P(z) = P_{\text{atm}}-\rho_0 gz ##, ignoring density variation. But actually, we have ##\rho(z)<\rho_0\;\forall z>0##. Hence, we are subtracting a bigger value from ##P_{\text{atm}}## than we actually should, meaning that we would end up what a smaller...

My book says: I don't understand why the bottom eye only sees the horizontal red arrow and not the other angles (black arrows)

When the US first developed nuclear weapons against the Nazis and Japan, their primary concern was whether the nuclear reactions can trigger the atmospheric nitrogen to fuse and burn the whole atmosphere. However this claim was instantly debunked by physicists. Their reasoning is that in order...

My understanding of why Mars lost its atmosphere was because it cooled down too much internally and that when this happened, the planet lost its magnetic field that helped protect it from solar winds (which then ended up stripping away the planets atmosphere). Is there anything that people could...

There are several possible goals related to terraforming Mars. In the short term, Earthling visitors will need to stay indoors or venture out only in pressure suits. But there would be enormous convenience and safety benefits in raising the Martian atmospheric surface pressure from it current...

If outer space is a vacuum there is no force in a vacuum to create friction, therefore if a vehicle i.e. spacecraft space shuttle is it a vacuum and produces any amount of thrust it should move a constant through space continuing to add thrust will only make the craft move faster until it...

Summary:: I have been trying to do this question for a while using the hydrostatic relationship to put rho and z in terms of p, however, I can not seem to end up with an answer. Can anyone suggest where to start. The question is as follows:

Could they generate enough lift for 1/11th the weight of a human? Was picturing a giant warehouse and curious if it would work!

Ocean physics explain cyclones on Jupiter https://phys.org/news/2022-01-ocean-physics-cyclones-jupiter.html Moist convection drives an upscale energy transfer at Jovian high latitudes https://www.nature.com/articles/s41567-021-01458-y...

So I just realized that on the internet the number that frequently pops up with regards to the total mass of the Earth's atmosphere is 5,100,000,000,000,000,000 kilograms. For example, the number is mentioned two times on the Wikipedia page for the Earth's atmosphere, there are more examples...

How much of Earth atmosphere consists of condensed phases? What is the breakdown of these condensed phases between those that condense in atmosphere (water) and those that do not (rock)? The total amount of water in Earth atmosphere is quoted as a 25 mm layer on average - total of about 13 000...

Hi ! I ask you two questions: 1- If hydrogen escapes from the Earth's atmosphere as it happens, because if there are anaerobic bacteria that produce hydrogen naturally among some other living beings, because among the thousands and millions of years that life has been on earth, hydrogen was...

So for a collection of particles each with mass m, the pressure beneath them, ##p(z)## should be higher than the pressure above them ##p(z + \Delta z)##. This is a change in force per unit area (force per unit volume I suppose) times a volume to equate with the gravitational force $$ \frac...

The Earth Rotates at complete revolution at 24 hours, the troposphere and stratosphere are dragged along with it at the equator, but what about 100km-1000km above the equator? Is there a formula or chart that astronomers can use to predict the tiny amount of drag that satelites have to encounter...

https://physics.csuchico.edu/~eayars/publications/AJP00961.pdf http://www.phys.utk.edu/demoroom/MECH/The%20Vacuum%20Canon.pdfSo I get the outside atmosphere is what provides air density and such in the pdf above^. However, why is it that most cannon demonstrations use just the air from the...

On April 20, 2021, an experiment on the NASA Perseverance Mars Rover broke down the CO2 Mars atmosphere to 2CO + O2. That makes it the first instrument to produce Oxygen on another world. Still a ways to go, design maximum is 10 grams per hour, people need around 60 grams per hour...

Summary:: Hypothetical discussion of a method to turn oxygen into fluorine through the use of another chemical and also discussing the biological effects of fluorine. Hello, I'd like to start this by saying my knowledge of chemistry is extremely basic. I barely graduated chemistry in high...

V = V(n,P) PV = nc dV = (-cn/P²)dP + (c/P)dn dW = (cn/P)dP - (c)dn This was how i tried to attack the problem, but it will end with log and probably it is wrong, any tips to fix it?

I find this video absolutely amazing, and have watched it over a dozen times now. It helps if you can use the spacebar to pause it and read the text, and arrow keys to back up 5 seconds. - This is NOT phone friendly! Big monitor and 1440p recommended. So two different questions for...

What is the population density of ##H^-## hydrogen anions in the Sun's atmosphere, how stable are they, what limits their numbers, and since they are the dominant source of opacity in radiative transfer in stellar atmospheres, what do they effectively "hide"?

<Mentor moved thread to Science Fiction> Hello one and all. I'm fascinated by the idea of breaking down methane and carbon dioxide and using the carbon as a building material (graphene being the preferred material rendered from this process). Can anyone tell me anything on where the current...

Has MESSENGER found evidence that Venus originally had a nitrogen atmosphere, and might have been more habitable, and the present amount of CO2 was released by some cataclysm afterwards? https://phys.org/news/2020-04-lucky-messenger-upends-long-held-idea.html

why isn't Surface tension reliant on the composion of the atm? For an instance; If you place a glass of water in a room with regular atmosphere or you place it in a room filled with other gasses. The coefficient of surface tension of the fluid will change? Maybe? why isn't viscoty of a fluid...

Einstein's synchrony convention (ESC) defines the one-way speed of light as equal to the roundtrip speed IN A VACUUM, at least, the discussions and papers I read on it (even Einstein's 1905 paper) always seem to set the context as in space (a near vacuum) or in a (theoretical) vacuum. I'm...

How would I tackle a problem like this? I made a start by writing down the ideal gas equation and then done some manipulation on both sides to get the density expression of the ideal gas. I'm not sure if this is what the question wants as I'm dealing with 2 different types of gases in the same...

I'm pondering the behavior and persistence of rocket exhaust plume molecules far above the atmosphere. For example, the plume from an apogee circularization thrust from GTO (Geosynchronous Transfer Orbit) to GEO (Geosynchronous orbit). CO₂ and H₂O are among the molecular species emitted by a...

I have read an article in Quora, where a person says that "Gravity pulls the atmosphere towards itself and that's one of the reason why our Atmosphere is still this way" and also adds that, "gravity is the reason we have air pressure in the first place. Gravity pulls on the atmosphere...

If trees are cut and then burned they have not reduced the CO2 in the atmosphere at all. And if they are left in the forest and then rot 90% of their mass also go back into the atmosphere. Here in Germany we have many old salt mines. I wonder if it would be a good idea to cut trees and store...

I didn't notice this forum section until just now, I noticed it as I was scrolling down to the general area to ask if anyone knew of a forum that deals with climate science. What ways can we detect CO2 in the atmosphere. I've seen some social media posts that show an image of South America that...

There is no sound in space because there are not enough particles to transmit the pressure wave. But what about really high in the atmosphere where there is just a little air? Would sound move faster, slower or at the same speed? Would the intensity (aka volume) go up, down, or stay the same...

Hello! My name is Fabrizio, I'm a high school student doing some research on the atmosphere. Right now, I'm trying to figure out how much matter escapes into space via Jean's Escape. I've found several formulas, all of which require me to know what the amount of particles per m3 of a certain...

Used to play with gravitational attraction simulations ages ago. One thing I noticed it was difficult to get a small object to collide with a bigger spherical one vertically and far more likely to hit at an angle far from 0. Has the math of this been worked out for asteroids entering the Earth's...

Hello all. I have a question about gasses and pressure: Is there a way to calculate how strong a material making up a balloon has to be to withstand a given pressure difference between the inside and outside? In other words, if I have a balloon I need to fill to a pressure of 10atm inside vs...

I am trying to design a water vessel system that maintains it's water level as it is consumed. In item 1. It's a simple water barometer, where the height of water in the column can be supported by atmospheric pressure until 10.34. In item 2. There are two columns that are open to atmosphere...

Both the cz (Czochralski Process), and Float-zone refining of silicon require an inert atmosphere, usually argon. How pure does the argon atmosphere have to be? How high of a vacuum has to be pulled before releasing argon into the tank?

I'm curious as to how the mass of a body affects the kind of atmosphere it can hold. I know that Earth tends to lose its lightest gases over time, which is one reason why helium doesn't build up in the atmosphere, whereas planets like Saturn and Jupiter have held on to lots and lots of hydrogen...

In the news we learn that aircraft (that don't exist) flying to 12 miles in altitude might be used to deliver "sunscreen" to the upper atmosphere. Could we use a carbon fiber fabric to make a strong, relatively lightweight, and flexible smokestack that might be supported by large helium lifting...

https://www.sciencedaily.com/releases/2018/10/181029130951.htm What do you think the advancement of technology is doing to the Earth?

Hi everyone I've read that if Earth had no atmosphere it'd be completely frozen over with temperatures around 255K. Why is this the case when the moon has daytime temperatures of 373K (and night time temperatures of 100K)? Why wouldn't the oceans thaw during the day? Are they just too big...

Does atmospheric refraction only work at certain temperatures, distances, and shape of the object (i.e. only spheres)?