Gases Definition and 476 Threads

Alright, ASSIGNMENT it is required of me to to the physics part in a group project where the topic is "causes of global warming". my group has chosen methane clathrates or methane hydrates if you like (in the ocean, not on land). The way these work is that it is methane gas that is trapped in...

Homework Statement From Giancoli's UC Berkeley edition Physics for Engineers and Scientists: A 2.00 mole sample of N2 (nitrogen) gas at 0 degrees C is heating to 150 degrees C at constant pressure (1.00 atm). Determine the heat added to it.Homework Equations Variables in equations: V = volume...

Hi Everyone, I have a problem that I've been working on and I'm having a little trouble. Essentially I have a tank with a known leak rate at a given pressure and temperature. We are currently using hydrogen, but I need to know what the equivalent leak rate would be if we changed the gas to...

Bernoulli's equation as I understand it is an expression (or possibly a consequence) of conservation of energy in an incompressible fluid flow. My question is: how can the "standard" Bernoulli's equation ever apply to an ideal gas? Wikipedia gives a different version of Bernoulli's...

Here are some general questions regarding my current reading. I am looking in my text at 2 equations for specific energy and specific enthalpy: u = u(T,v)\qquad(1) h = h(T,p)\qquad(2) Question 1: Are not the properties fixed by any 2 independent priorities? Why have we chosen to...

Homework Statement not really a question, just stuck with something. An airflow of 300 CFM has a contains 0.0387% CO2 (carbon dioxide-naturally occurring in air) flows through two ends of an rectangular open container from an exhaust fan located at the bottom. Within the container 100%...

For an isochoric process, dV = 0 therefore dW=0 So from 1st of Thermodynamics, dQ = dU + 0 or, n*Cp*dT = n*Cv*dT (Cp and Cv denote molar heat capacities of the gas at const pressure and volume resp.) therefore we get Cp = Cv .(how can this be possible once we know Cp - Cv = R ?)

Homework Statement A scuba diver releases a 2.50-cm-diameter (spherical) bubble of air from a depth of 11 m in a lake. Assume the temperature is constant at 16.0ºC, and the air behaves as a perfect gas. How large is the bubble when it reaches the surface? Homework Equations V2 = V1*(T2...

Question:Dalton’s law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of gases making up the mixture. Give a convincing argument for this law based on the kinetic theory of gases. Answer to this question from the book I...

I read somewhere that a special fluid, called hydrofluorocarbon, is used in refrigerator. It carries hot temperature from the refrigerator and put it out. They says that it has a low specific heat capacity and low liquid/gas transition point (room temperature). Now my question is why ideal gas...

I have a question about how to calculate the mass/mole of a combustion gas. In my own research, I came across two methods. The first method is suspect in my opinion. The second I trust, although the discussion left some issues unexplained, so I attempted to fill in the details as best I...

A rocket with initial mass of 7.30×103 kg is fired in the vertical direction. Its exhaust gases are ejected at the rate of 6.00×101 kg/s with a relative velocity of 2.100×103 m/s. What is the initial acceleration of the rocket? What is the acceleration after 29 s have elapsed?

Note: This isn't intended to be a Global Warming thread but rather a Greenhouse Gases thread (they're not the same thing), so please let's not talk about Global Warming because I don't want it closed. I'm very interested on any feedback or thoughts anyone may have for my experiments...

Hey I'm studying the Kinetic Theory of gases and although it's in a chemistry book it employs physics concepts ergo I have come here to ask you nice people :biggrin: The 5th point is where I have a problem, the rest is just information for you. I am assuming a particle is in a cube (ideal...

first i want to apologize if I'm posting this in the wrong section. my first post here. I know that all gases expand at the same rate at consistant pressure when heated. My question is do different gases expand at different volumes under equal pressure and heat? If so what would be some...

Homework Statement Containers A and B in the figure hold the same gas. The volume of B is four times the volume of A. The two containers are connected by a thin tube (negligible volume) and a valve that is closed. The gas in A is at 300 K and pressure of 1.0*105Pa. The gas in B is at 400 K and...

Homework Statement In the gas phase methyl isocyanide (CH3NC) isomerizes to methyl cyanide (CH3CN) in a first order reaction with a rate constant of 7.70x10^-4s^-1 at 500K. An experiment is performed, where 25.0 torr of methyl isocyanide is placed in 23.2L container at 500K. After 520...

Homework Statement The Stephan Boltzman Law used in black body cavity situations is sometimes used when dealing with gases, is this a valid use of the equation? Homework Equations H=AekT^4 H is heat current in radiation A is the area e is the emissivity k the Stephan Boltzman...

Calculate the heat capacity ratio for a diatomic ideal gas. ---- Using the equipartition theorem, I calculate: Cp / Cv = (Cv + R) / Cv = (7/2 R + R) / (7/2 R) = (9/2 R) / (7/2 R) = 9/7 ~ 1.286 According to the equipartition theorem, I assign each vibrational degree of freedom 1 R and...

Happy New Year to all you Physics Geniuses out there! I have a question concerning how the optical emission spectrum of a gas would be affected by being dissolved in water. I know very little about spectroscopy so please forgive me if this seems like an idiotic question. Let's assume I...

Hello every one :) Actually i was studying from Charles Kittel ( introduction to solid state physics ) about crystals of inert gases , then i asked my self how could inert gases forms a crystals , i couldn't answer that , and no place to read about it :( . So can you people...

Hunting season has arrived where I am located and I have had to choose a bullet/cartridge combination to hunt with. To do this I had to decide what range I would likely shoot, how much drop or drift I was willing to tolerate, the amount of recoil I could handle and lastly would the kinetic...

Two separate flasks are each filled with a gas at 25 degrees Celsius; the valve between them is opened and the gases are allowed to mix. What would be the final pressure in torr after mixing, if initially F2 is in the first flask (Volume = 2 L) at 271.78 torr and N2 is in the second flask...

Homework Statement At 318 K and 1.04 x 10-2 atm, the density of a gas is 1.75 x 10-5 g/cm3. (a) Find vrms for the gas molecules. (b) Find the molar mass of the gas. Homework Equations vrms= sqrt (3RT/M) pV=nRT pM=dRT pV=(m/M)RT The Attempt at a Solution the main problem i...

Homework Statement 3.50 g of magnesium metal is added to 100. mL of 2.00 M aqueous hydrochloric acid. The substances react to completion, producing aqueous magnesium chloride and hydrogen gas (H2). How many liters of pure hydrogen gas, measured at 0.00oC and 1.00 atm are produced in this...

Relations for an ideal Fermi gas: \frac{P}{k_BT}=\frac{1}{\lambda_D^3}f_{5/2}(\lambda) \frac{1}{\upsilon}=\frac{1}{\lambda_D^3}f_{3/2}(\lambda) But in some book books I find \frac{P}{k_BT}=\frac{g}{\lambda_D^3}f_{5/2}(\lambda)...

Hello everyone, The partial pressure of the atmosphere 33 feat benath the surface is doubled the normal amount. (2x760 mmHg). I can understand how lower you go down higher the pressure but I don't understand how you can measure atmospheric pressure under the sea. I mean under the sea you got...

Hello everyone, Ok to understand the respiratory system, proper understanding of this diagram is essential. Something I don't have, so if anyone can help me with these questions I would be very greatful. Thanks :smile: http://img515.imageshack.us/img515/8923/rightbv.jpg 1. Anatomic dead...

I've been told that gases take on the volume of whatever container they're in but what about Pv=Nrt ? Would it be possible that the calculated V is smaller than the container's volume? Thanks

Hi, Anyone know where I can find thermodynamic properties of gases at high pressure? More specifically I need to find the kinematic viscosity or the absolute viscosity of air at around 300 degrees Kelvin and 330 bar. Cheers

3 Gases On a Graph, Which is True ?? Homework Statement http://img103.imageshack.us/img103/9302/spdistus8.jpg Based on the distributions show above, which statements for the three gasses I II and III are true? Note that the temperature is constant for all three. a) Gas III is the heaviest...

Good morning, (This is not homework; just curiosity) I found a little problem concerning Theory of Gases. I was able to solve it, but I want confirmation about if this is correct or not. Homework Statement Suppose I have a cube-shaped box, with edges measuring 20 cm = 0,2 m, which...

Homework Statement Consider a mixture of oxygen and hydrogen kept at room temperature.As compared to a hydrogen molecule an oxygen molecule hits the wall- (a) with greater average speed (b)with smaller average speed (c)with greater average kinetic energy (d)with smaller average kinetic...

if air is made up of only 2gases oxygen and nitrogen, and the molecular mass of air is 29g/mol, find the % of each component in the air, what i thought i should do is make 2 equations, Mw(O)=16 Mw(N)=14 X*16 + Y*14 = 29 (in 1mol of air) X + Y = 1 but the solution to this is not...

This is actually related to Thermodynamics but as it comes directly under the Mechanical field I'm asking it here and I invite all my fellow Mechanical Engineers and Physics Experts to answer this. The question is : How does the Tempreature of a gas change (increase) when the gas is...

Homework Statement Hg is spilled in a laboratory which measures 15.2m long, 6.6m wide, and 2.4m high. Find mercury vapor in grams at 20C room. Given vapor pressure of Hg = 1.7E-6 atm. Homework Equations The Attempt at a Solution Volume= 15.2*6.6*2.4 =240.768 m^3 = 240768 L Temp = 20 +...

Homework Statement What volume of air (T=25C, P=1atm) is required for complete combustion of one litter of gasoline? The partial pressure of oxygen in the air is 0.205 atm. One litter of gasoline contains 6.15 moles octane C8H18. Homework Equations The unbalanced reaction is: C8H18...

Homework Statement A square box contain He at 25C. If the atoms collide with wall perpendicularly (90 degrees) at rate of 4.0E22 times/s, calculate pressure and force exerted on wall given area of wall 100cm^2 and speed of atoms =600 m/s Homework Equations PV=Nmv^2 The Attempt at a...

Homework Statement Thermal Dynamics question, gases? So I have this box with lengths 20cm on each side. There are 100 balls inside of it with diameter 5mm each. The density in the box is 7.8 g/cm3. The bottom of the box vibrates so the balls bounce around. The top of the box has a movable...

Two ideal gases are mixed in the box of infinite height placed in constant gravitational field. There are n_1 moles of the first gase and n_2 moles of the second. Their molar mases are M_1 and M_2 respectively. Let's assume that the temperature is constant. What's the molar concentration as...

Please can someone give me a solution of this problem? One liter N2 at 2.1 bar and two liters of Ar at 3.4 bar are mixed in a 4L flask to form an ideal gas mixture. calculate the value of the final pressure of the mixture if the initial and final temperature of the gases are respectively 304...

In the kinetic theory of Gases , we rely purely on classical mechanics. We derive the equations using classical mechanics, and they turn out to be fairly accurate at ideal gas approximation condition of low pressure and high temperature. Now my question is, since in the kinetic theory , we...

What is the difference between a gas and a vapour? I remember one of my lecturers saying that there was a slight technical difference, but i don't think he ever did explain it because it was not important for what we were doing. I did a quick google search and one of the results i found was...

Im trying to figure out how to find the dE/dx for a mixture of gases. I can find how to figure it out for an individual molecule knowing dE/dx for each element, but can't find how to find it for a mixture of two molecules of gases knowing dE/dx for each gas. Is there anywhere I can find the...

Does anyone know figures for Diffusivity (diffusion coefficients) for two gases at different temperatures. Such as air - Hydrogen or air-methane. For example the diffusivity of hydrogen into air when the hydrogen is at 300C and the air at 100C. Please don't point me to Fick's laws...

Homework Statement Superman leaps in front of Lois Lane to save her from a volley of bullets. In a 1-minute interval, and automatic weapon fires 150 bullets, each of mass 8.0g, at 400 m/s. The bullets strike his mighty chest, which has an area of 0.75 m2. Find the average force exerted on...

Is there any kind of semipermeable membrane which would diffuse gas but wouldn't let liquid to pass. If yes what would that be? Thanks, Vladimir.

a container with a volume of 61cm3 is filled with gas F2 at a pressure of 250mmHg and a temp of -85 C. a small amount of solid P4 is put into the container and a reaction occurs according to P4(s) + 6F2(g)--> 4PF3(g) the container is again cooled to -85 C and the pressure is now measured...

My question is: Simple kinetic model for solids, liquids and gases. I searched on google and find these result but I don't know whether it was right. And also I think it is too long to do in an exam. :smile:. Please help me to check it. Thank you. Model for liquid This is the link for the...

I remember reading before that hydrogen gas is "transparent" to gamma rays. What does this mean? I know it has something to do with the gamma rays not heating the hydrogen. Also, would Xenon gas be transparent to gamma rays?