Atmospheric Definition and 261 Threads

I am still trying to assess the ability of the sun to heat a house through glass and I am a bit stuck . Most solar flux /radiation measurements I have found are based on a total of direct and diffuse radiation on a horizontal surface and then formulated for vertical surfaces with some cosine...

Hello gentlemen! I'm rather new to this whole complex world we call compressed air. :) Put simply, I have spent the past 4 hours trying to find this answer anywhere and I am just not informed enough about all these numbers to get what I need to find out. I have an air cylinder that is...

1. There are many different definitions of the location of the top of the atmosphere – the near edge of outer space. • Until around 1600, it was believed that the Earth’s atmosphere extended throughout space (recall that the Earth was also considered to be the center of the Universe until...

I was reading a new paper titled "Impacts of Climate Change on Marine Organisms and Ecosystems" when I came across this statement: It has been suggested that a CO2[atm] of 450 ppm is a critical threshold beyond which catastrophic and irreversible change might occur [7] this would bring a...

I would appreciate assistance with a thought experiment I've been having trouble with. What I asked myself was, If I had two Lasers of equal Intensity/power, say 200 milliwatts, one appearing green and the other red, with wavelenghts of say 555 nanometres and the other 660 nm, which laser...

Homework Statement A cylinder with a frictionless piston of mass M and cross section S is placed vertically in an atmosphere of pressure p. The cylinder is rotated 180 degree so that the opening of the cylinder faces down. During the operation the temperature of the gas inside the cylinder is...

I am looking for a formula to let me obtain a pressure reading comparison for two different tests based upon the following information: I have a given flow rate in liters / minute. (same for each test) I know the size of the orifice that the water is flowing through. (same for each test)...

Does anyone know a good reference for absorption lines in the Earth's atmosphere at visible and NIR wavelengths (if there are any)? For example, perhaps in the range of 3500 Å to 8000 Å? I find that the search terms are too broad to give me reasonable results on ADS. I found some atmospheric...

This ones not homework, this ones just a noob begging for any help he can get, but i figured this would probably be the best place to ask. What I am doing is building a free/open source rifle 'game' for Blender3d's game engine (python scripting) with moderately accurate ballistics (several...

As you go deeper underground, to calculate the total pressure at the subterranean point, would you sum the atmospheric weight plus the weight of the overlying soil? How does this work exactly? Thanks.

G. Gerlich, R. D. Tscheuschner (2009) Falsification Of The Atmospheric CO2 Greenhouse Effects Within The Frame Of Physics. International Journal of Modern Physics B, Vol. 23, No. 3 (30 January 2009), 275-364 (World Scientific Publishing Co.) see...

http://webusers.ct.astro.it/gca/papers/telluric.pdf Would it be possible to use telluric lines to give accurate measurements of atmospheric gases along with synchronous Earth temperature measurements, thus giving an index for gas abundance and variation of heat transfer through same gases...

Hey all, I have a question concerning atmospheric pressure. I understand that there are two ways to look at pressure, at micro scale (kinetic theory) and at macro scale (seeing pressure a a state variable). Now i'd like to understand atmospheric pressure using both perspectives. At...

Homework Statement What is the absolute (total) pressure at the depth of 15 m below the surface of the sea. Assume density of seawater is 1.03 g/cm3 and g=10 m/s2. Give answer in kPa. Use atmospheric pressure is 101 kPa. Homework Equations P = F/A P1V1=P2V2 The Attempt at a...

Ok I do not get WHY an object boils when atmospheric pressure is equal to Vapour pressure. Can anyone explain this? In my textbook it doesent explain it at all.

The number of stomata on leafs (breathing pores) of certain plant species appears to be sensitive to the CO2 level in the atmosphere. If it is higher, it appears that these plants does not bother to make many stomata, whereas CO2 is scarce, it simply makes more stomata to extract the CO2 from...

Can anyone give me a layman's description of what happens to air molecules interacting with a supersonic object based on Kinetic Molecular Theory? Perhaps another question, how does sound waves look like at the molecular level? How does sound propagate through the random bouncing of air...

Please, write what is wrong with this reasoning: ATMOSPHERIC POWERPLANT The main idea of global warming is that greenhouse gases prevent the energy from leaving the surface of planet. In the same time the upper layers of the troposphere are much colder and successfully emit the infrared...

Homework Statement What exactly is it? How would I find it for Mars? Homework Equations The Attempt at a Solution

Homework Statement A stream of water flows vertically downward at a speed of v1 = 2.0 m/s from a faucet of cross sectional area A = 0.5 cm^2 to the bottom of a sink a distance h = 20 cm below. Homework Equations Bernoulli's P(atm) + (rho)gh = P(atm) + 0.5(rho)v^2 The Attempt at a...

In Physics classes at college I was taught that atmospheric pressure is due to the weight of the air above a body. I understand this and all related equations and concepts. But just the other day I was reading up on gas laws in a chemistry book. In that book it stated that atmospheric...

Hi, Atmospheric gamma-ray extensive air showers are induced by pair-production interactions. The equation that governs pair production is: \gamma + \gamma = e^- + e^+ My understanding of the interaction is that a gamma passes "close" to the electric field of a nucleus. The nucleus acts...

Hey, does anyone have an equation that roughly models atmospheric density from sea level to about 200 km up?

Hello everyone. I have searched the forum and didn't find a discussion about atomospheric water generation anywhere so far. If you know of a better place for this post, please let me know. There are several companies that claim to extract water from the atmosphere. Does anyone know how to...

I've googled quite a bit. Other than finding articles that require payment to view I have found nothing usable. I need a source - possibly a table would be best - of estimated oxygen levels since the Cambrian. Thanks. - Reason: the only text I have was out of print during the Eocene...

Hello, just need some guidance - I hope my logic is correct! Homework Statement So I have a scenario where the Earth's atmosphere, instead of scattering blue light from the sun, actually scatters green light based on Rayleigh scattering. I know that the sky will therefore appear...

Hello, So I have a scenario where the Earth's atmosphere, instead of scattering blue light from the sun, actually scatters green light based on Rayleigh scattering. I know that the sky will therefore appear green, but how will the sun appear? I reasoned the sun will be magenta using...

Homework Statement The density of mercury is 13595 kg/m^3. An barometer on the planet X shows a pressure reading of 1500 mm-Hg. The gravitational field strength at the surface of the planet is 12.0 m/s^2. What is the atmospheric pressure at the planet's surface? Homework Equations P =...

How big would a vacuum-filled chamber need to be (built with currently existing materials) in order for it to displace enough of the atmosphere so it starts floating? Think about it, such contraptions would work like ships, except they don't float on water this time, but up high in the...

I am a little rusty on my differential equations as I haven't seen them in a few years! I am looking for some direction on a question on a first order ODE. I am trying to find the time required to drain a tank that is open to atmosphere. Any help would be appreciated. Thanks!

ok my problem is that the question asks The palm of Sheila's hand has an area of 0.0017m2.If the atmospheric pressure on the palm is 100,000 Pa, what force is being exerted on Sheila's palm by the atmosphere? I know the formula is not P=F/A I know you have to change the formula around but...

I've read my lecture notes about 100x but can't even begin to see where this derivation can come from. A previous derivation was the equation dP/dz = -gρ (P = pressure, z = distance, g= acc due to grav, ρ = density) If atmosphere can be treated as an isothermal ideal gas of constant mean...

Currently 241 exoplanets. [URL="[PLAIN]http://en.wikipedia.org/wiki/Gliese_581_c"][http://en.wikipedia.org/wiki/Gliese_581_c/URL][/PLAIN] A few are terrestrial such as Gliese c, d at 5x and 8x Earth mass; sufficient mass to be geologically active, and hence a magnetosphere, diverting a stellar...

Consider a hypothetical planet of given radius and mass. What atmospheric density would generate the most frictional heating on a standard sphere falling from infinity to the planet surface?

How does the summer solstice affect the position of Hadley cells? I know that the solar equator is 23.5 degrees North, which differs from the 0 degrees (as a solar equator) for the equinox. For the equinox in the N. hemisphere, there are three Hadley cells, or cells of circulation. The range of...

[b]1. I would like to convert 1 milligram of water to mililitres at room temperature and atmospheric pressure I know that they are equivalent at3.93 celcius and an air pressure of 1013.25kPa Homework Equations 1mg=1ml at 3.93 celcius and 1013 kPa The Attempt at a Solution unsure

The half-life of Carbon 14 is 5730 years and the activity of atmospheric carbon due to Carbon 14 is 255Bq/Kg. What proportion of atmospheric carbon atoms are Carbon 14. Attempted solution Decay constant for C14 = ln(2)/t(1/2) = ln(2)/5730 = 1.21x10^-4 Current activity A =...

:biggrin:please tell me how it was calculated, atmospheric pressure = 760mmHg, practically and theoritically :devil:

I just wanted to ask a quick question that maybe someone knows off the top fo their head. How does the refraction angle of the Sun at the sunset vary as a function of the observer's height. i.e. if you are standing on a tower looking over the ocean, is the refraction deviation of the Sun at...

I realize that Starlight atmospheric absorption depends on frequency, but I was wondering if there are any tables indicated total bolometric absorption at Zenith relative to absorption at Sea Level. Obviously atmospheric absorption is much less on the top of Everest than in my hometown (a few...

Homework Statement If you had a tube running from the top of one tank at a lower level to the top of another tank at a higher level. And the water could only flow in one direction towards the higher tank. And the water level in the high tank started to descend. I think the tube would...

Hi, I'm working on a project on the Green Flash and have so far been building up a program to produce the 1976 US Standard Atmosphere. I have produced the density profile for the first 86km (which I'll assume to be enough for now) and now need to convert it to a refractivity index profile...

How buoyant force and atmospheric pressure can be helpful in life ?

Homework Statement A balloon whose volume is 500 m^3 is to be filled with hydrogen at atmospheric pressure (1.01x10^5 Pa). a. If the hydrogen is stored in cylinders of volume 2.5 m^3 at an absolute pressure of 35x10^5 Pa, how many cylinders are required? Assume temperature of hydrogen remains...

3 pages double spaced. Can someone please comment on it before Sunday? That would be nice. Thanks! the file located at http://students.washington.edu/achen89/3_boundarylayer.doc . Please feel free to e-mail corrections to hemaalpha@gmail.com Human civilization (and biological phenomena) has...

My question states: Given that the ground-level pressure of the Earth’s atmosphere is 1.033 *10^5 N m^−^2, calculate the mass of the atmosphere. If the ground-level atmospheric density is 1.293 kg m^−^3, calculate the scale height. For the first bit, I used P=nKT, assuming a temperature of...

Is it possible to extract methane from the atmosphere to use as energy or hyrogen source? The advantages are obvious: clean, renewable, and global warming reducing. Is it theoretically feasible but not practical at the moment (like nuclear fussion power generation)? If so, I just wonder why...

Im glad this website is here for help, cause physics is nuts, but i enjoy it. question is at 11km below sea level what is the pressure in atmosphere. now I've got the equation p=(h)(g)(d) ive got g=9.8 m/s d=1030kg/m3 (given to us) but the height is what is throwing me off, in...

Did anyone in the uk see the moon last night ? it was so bright, and seemed to have a three lobed halo surrounding it, is this just atmospherics ?

I've been given some homework questions (about the solar system, but I'm sure that it fits in this section of the board) and its all fine until I get to the part asking about atmospheres. I have a feeling that I know what I'm supposed to do, but I feel that I'm missing something blindingly...