Atmospheric Definition and 261 Threads

What timefram does short term atmospheric retention mean?

Hi all, This is my first post. I am a fourth year undergrad doing a project on astrobiology. in order to do calculations of meteorite impact on the surfaces of europa, enceladus, and mars, i need their atmospheric density profile models. Any idea where i could find those? thanks in...

First post, long time lurker. Supposing that mankind were to first choose the Moon as the celestial body for colonisation (no questions at this point, those in favour of Mars pretend for a second it has some sort of life on it!), how would we go about creating a significant atmosphere on the...

I have a question I long pondered and couldn't find any explanation to exactly what I want. We all know that atmospheric pressure is due tu gravity acting upon everything on earth. this pressure act from all directions on all our body molecules. However in space there is no gravity, no...

What does the atmospheric pressure have to be to make the boiling point of water 20 C?

I you look at the phase diagram, CO2 is in liquid state at 5,11 atm and t= -56 C. But why does he convert directly to solid state at 1 atm? Again, if you go down from five to one atm, you should be in gaseous state ? Is it have something to do with temperature ? What happens with temperature...

Homework Statement I'm trying to find sketches that demonstrate ,the general circulation patterns of the atmosphere and the cells in atmosphere of a planet.3 cases must be considered:a slow rotating ,a fast rotating and a non rotating planet. Homework Equations The Attempt at a...

Homework Statement I have a Torricelli barometer column filled with mercury. Situation 1: Temperature1 = 20° C. Height: 0,760 m. Outer pressure:1 atm. Situation 2: Temperature2 = 35° C. Height: 0,762 m. Coefficient of termic dilation in the interval (T1, T2): 18,2 *10^-5 (°C)^-1 Find...

Atmospheric C14 is measured "permil". Permil of what? I'm interested in understanding how the level of atmospheric radiocarbon has declined since atmospheric nuclear testing ended. Please excuse my ignorance of what is no doubt something extremely elementary. Atmospheric C14 measurements...

Ok, so 1 atm≈101,300 Pa that is 101,300 Newtons per square meter, presumably at sea level. If we look at the force in terms of lbs this is 101,300 N* (.225 lb/1 N)≈22,792 lb. The pressure per square meter seems pretty intense to me when I thought of it in terms of force. I didn't ask my...

Hello All, It is said that Earth has an envelope of gases (air) surrounding it and that due to gravity the weight of this envelope of air exerts a force: on the surface of Earth and any thing on it. The weight of air column on any surface divided by the area of the surface is...

While searching net, I recently have come in touch with two very interesting patents. Both applications were patent granted. Both claim to produce electricity by using atmospheric heat. Here they are...

Say you have a giant mercury barometer. Let's suppose that the area exposed to atmospheric pressure is 1 square meter Normal pressure at sea level is 101325 Pa Lets say the variation in 24 hours in atmospheric pressure goes from a low of 100,000 Pa to a high of 102,000 Pa Using...

Homework Statement The problem is this: If T(temperature) AND P(pressure) of air increases, what can we assume about D(density)?Homework Equations Well, I know that as temperature increases, pressure increases and vice versa. When you try this question out with the equation P=KdT it doesn't...

Hi, first time posting here. I was watching a show about hydrogen/helium balloons and it got me thinking about buoyancy in atmospheric gasses (nitrogen) and what might work better than the common gasses and I considered that since the goal of a balloon is to reduce the internal mass relative to...

I am new here and I have a question about pressure. My idea about atmospheric pressure is that it is a pressure caused by the force directed downward due to the weight of the atmosphere. If that is the case, does it mean that we doesn't feel any pressure horizontally? Please correct me if I am...

[I realize and understand that trying to harness storm lightning is fairly impossible/impractical, so that is not the focus here, unless someone has some info contradicting that.] The basic question I have is this: there is a strong altitude correlation in the distribution of positive (higher...

Consider the following two-step process. Heat is allowed to flowout of an ideal gas at constant volume so that its pressure dropsfrom PA = 2.7 atmto 1.4 atm. Then the gas expands at constant pressure, from avolume of 6.8 L to VC = 13.1 L where the temperature reaches its originalvalue. See Fig...

What is correlation between temperature and atmospheric pressure? For example, why does Titan have 1.6 times the atmospheric pressure of Earth despite having pretty much the same atmospheric 'weight', for lack of better term. (Total atmospheric mass times gravity.) EDIT: Is this the right...

I'm going to be very careful to avoid the word "greenhouse" because of the indefinite ban on discussions about climate change - I want to be clear, this isn't a topic about that. Part 1 - some gasses in the atmosphere absorb and emit radiation in the thermal infrared range. Gases like water...

I am not sure this belongs here. However, I could not think of where else to put it. I am rewriting an old Stellar System Generator originally began way back in 1983. I kept updating and revising it until the death of my family in 1997. I just recently found it in some old file boxes and...

Building an "atmospheric chamber" I have to build a chamber (ok, large box) to do some atmospheric pressure tests. The box will be 48 inches square. I have to simulate going from sea level (0 feet, 14.696 psia) to 7000 feet (11.34 psia). I'm thinking of building the "box" from 3/4" plywood...

Surprise, surprise! Another graduate program I'm considering at my university. I'm wondering how this would compare difficulty-wise to my math major, physics minor. It looks like most of the classes I'd take have Intro. to PDE as a prerequisite, e.g. Atmospheric Physics/Chemistry, etc. For my...

1. I got the correct answer but I am confused about the reasoning and want to understand the concept.. "Rank from most to least, the amount of lift on the following airplane wings: a. Area 1000 m^2 with atmospheric pressure difference of 2.0 N/m^2, b. Area 800 m^2 with atmospheric pressure...

http://www.theweatherprediction.com/ http://stratus.astr.ucl.ac.be/textbook/contents.html (Introduction to Climate Dynamics and Climate Modelling - free online textbook) http://wunderground.com, http://www.weatherspark.com, http://www.wrcc.dri.edu/ => good for historical data for any...

Hi, I'm doing some physics exercises but some don't result correct, could you help me? thanks! Homework Statement 1)Calculate the necessary force to open a 0.3 m length square metallic container with a 410 mmHg inside pressure knowing external pressure is 0,980 atm 2)There is a hollow...

For a given mass, as radius decreases, would atmospheric pressure increase, since surface gravity would increase? I'm assuming that atmospheric composition doesn't change. For a planet with radius = 1.1*Earth and mass = 1.3*Earth and atmospheric molar weight within 1% of Earth's, does a...

I guess the Earth's surface pulls around the lower atmosphere with viscous drag effects? What about the upper atmosphere? Does it rotate with a slower absolute tangential velocity? If so, is there any pressure difference that caused by the difference in velocities that would cause any...

How can one determine the color of another planet's sky from its atmosphere composition and parent star color? Earth's atmosphere is blue for most of the day, then turns red at sunset. Mars is sort of the opposite: it has a red sky which turns to a bluish hue at sunset. Until someone tells me...

atmospheric pressure is always exert on downward direction?? atmospheric pressure is always exerted on downward direction...but can i think soo it exerted in horizontal and also atmospheric pressure exerts from downward direction is it true?

Hello! Please excuse me if I posted this in the wrong place. I've never been too good at these forum things, but I did have a question about atmospheric perspective that I believe has more to do with physics than any other category on the forum. While doing a personal artistic study on...

If I have a 2,000 candelas red light source under normal rural atmospheric conditions at what distance would I expect the source to no longer be visible to the eye?

Homework Statement If the atmospheric pressure is 0.975 atm, what is the pressure of the enclosed gas when its an open-tube manometer and the h is 52 cm? The Attempt at a Solution I know you would have to set up a proportion. I was thinking .975 / 1 = x / 760 x = 741 torr But...

I don't quite understand why we see sunsets as red/orange/yellow. We see the sky as blue because Rayleigh scattering causes the smaller particles within the atmosphere to scatter bluer wavelengths and absorb others. But if the others are absorbed, which would include the red/orange/yellow...

The pressure exerted against the ground by an elephant's weight distributed evenly over its four feet is less than 1 atmosphere. Why, then, would you be crushed beneath the foot of an elephant, while you're unharmed by the pressure of the atmosphere?

Homework Statement The surface temperature of a city is 20 degrees celsius. What is the temperature at 2 km above the surface if the temperature decreases at "half the average rate" of the troposphere? Show your calculations. Homework Equations None really, it may be just simple math...

Hello. I've recently been working on the mathematics of atmospheric/stellar density, but I've run into an apparent paradox with the assumptions I have been using. I hope this is the right forum for this question. At the moment, I'm working on the equations for the atmospheric pressure/density...

I have a question about my watch which has been bugging me for a little while, and I was wondering if anyone could enlighten me as to the physics behind it. One day a while back I went out for a run in the rain and some water got into my watch, behind the glass. I only noticed because it had...

The normal atmospheric pressure is 760 mm of Hg. But the normal human blood pressure is around 120/80 mm only. In that case how equilibrium of our body is achieved? For any vessel to retain its original shape its inside pressure and outside pressure should remain equal. If the outside pressure...

This is something I've wondered for some time. Our spaceships need all this ablative heat shielding because they slam into the atmosphere at ludicrous speeds, thereby generating a ton of friction and heat. Wouldn't it make more sense to slow down first? There is an orbit where the speed of the...

Ignoring normal variations, I've always been told that atmospheric pressure is... 1 Atm = 101,325 Pa However, Wikipedia says atmospheric pressure was re-defined in 1999 to be exactly 100 kPa. This would mean that atmospheric pressure is now 0.98692 Atm...

If I Make two(many) tanks to fill water each one at different height levels. 1. Fill the lowest tank with water, open it to atmosphere. 2. close the second tank and create vacuum in it. make water flow from first tank to this till it gets filled. will this process allow me to store extra...

why don't we feel the atmospheric pressure although it is large ??

Recently, it has been found that Cl2 can be released to the atmosphere in the marine boundary layer through mechanisms that oxidize chloride (Cl-) in sea salt aerosol. The Cl2 is unreactive at night and can build up to significant levels. Upon sunrise, Cl2 will photolyze, releasing very reactive...

An atmospheric chemist wishes to measure O3 using a portable “ozone sonde” that will be attached to a helium filled balloon. The mylar balloon is non-elastic and has a fixed volume of 2.0 m3 when filled. The mylar balloon has a mass of 500 g when empty. The ozone sonde has a mass of 750 g...

Homework Statement How does the pressure at a point in a fluid vary with the depth of the point below the surface of the fluid? A bottle, full of air at atmospheric pressure, whose volume is 500 cubic centimeters, is sunken mouth downwards below the surface of a pond. How far must it be...

Homework Statement My teache recently assigned this problem but its nothing like the atmospheric problems we've done in class. Any suggestions on where to start? The cross section of the tube of a mercury barometer is 1 square centimeter, and when the barometric height is 760 millimeters...

Homework Statement gravitational constant G=6.67x10^-11 Nm^2/Kg^2, M=6.42x10^23 Kg, and R=3.40x10^6 m for mars. Calculate the atmospheric density of Mars. Homework Equations Density of water = 1000 Kg/m^3 Atmospheric pressure = 30 Pa (from what I've calculated) p=M/V The Attempt at a...

http://airs.jpl.nasa.gov/AIRS_CO2_Data/AIRS_and_CO2/" I'm not sure about the long term analysis will work out, but it looks to me like the Atmospheric Infrared Sounder (AIRS) instrument is providing fundamental data about how our climate works.

Hello all, i would like to know if atmospheric pressure exists on the surface of water in a completely sealed water tank. So, does atmoshperic pressure exist even on surfaces that are not in contact with the atmosphere, meaning in closed areas above. Thank you.