Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture, such as air, contains a variety of pure gases. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. The interaction of gas particles in the presence of electric and gravitational fields are considered negligible, as indicated by the constant velocity vectors in the image.
The gaseous state of matter occurs between the liquid and plasma states, the latter of which provides the upper temperature boundary for gases. Bounding the lower end of the temperature scale lie degenerative quantum gases which are gaining increasing attention.
High-density atomic gases super-cooled to very low temperatures are classified by their statistical behavior as either Bose gases or Fermi gases. For a comprehensive listing of these exotic states of matter see list of states of matter.
OK, so I need to bring this one to the forum.
I keep somewhat fanatical records on my vehicles. 69,450 miles ago there was a front end alignment done and the toe-in was set to +3/16" on the front end. My truck is a Toyota 4x4 which sees frequent off-road trips. Just over 1k miles ago I found...
Hi,
I want to calculate the amount of liquid nitrogen (at boiling temp.) needed to build a pressure of 10.1 bar in a vessel of volume 66 m3. The liquid will be poured slowly into the vessel, boil off and fill the volume with gas at the specified pressure. I make the assumption that the process...
Homework Statement
Consider a perfect monoatomic gas at pressure $p_i$ 1.2 atm and temperature $T_i$ 300K, that is in equilibrium inside a cylinder having a volume $V_i=1L$ and which piston has a mass of 1kg and is at an height of 50 cm. Admit that a mass M=3.13kg is over the piston. When that...
Homework Statement
Some gas at 300K is enclosed in a container. Now the container is placed on a fast moving train.is the change in temperature of the gas the same as the change dT observed when train suddenly stops?
Homework Equations
1/2mv^2=dU?? or dU=0??
The Attempt at a Solution...
Hi. I'm a mechanical engineer, but working as Safety Engineer. I have a question how to calculate the flow rate of hydrogen gas before a flow controller in case of leak through a 4.5 mm line at 35 bar pressure. Thanks in advance.
Copper pennies were placed into HCl which had been diluted with an unknown quantity of water.
The pennies look cleaner, ... remain un-corroded (as expected). There is a slight bit of gas being produced , with no smell, but can cause discomfort to eyes. Bubbles formed on the pennies for the...
Hi,
Joule's original gas expansion experiment is often presented like in the following link:
http://demonstrations.wolfram.com/JouleExperimentOnFreeExpansion/
The apparent lack of temperature change in this experiment is often used in textbooks to demonstrate that the energy of an ideal gas is...
Homework Statement
Homework EquationsThe Attempt at a Solution
I don't understand which concept to apply in this question . The hint says to apply Bernoulli's equation and uses ∆P (excess pressure ) = (1/2) ρ v2 . This does give right answer .
But I think this is wrong . We cannot apply...
Homework Statement
Homework EquationsThe Attempt at a Solution
Coefficient of volume expansion γ = ∆V/V∆T
VT2 = constant
Differentiating we get ,
T2∆V + 2VT∆T = 0
∆V/V∆T = -2/T
So , option 2) looks right . Is that correct ?
How do I interpret the answer ? Does that mean the...
A quantity of ideal gas undergoes an expansion that doubles its volume. Does the gas do more work on its surroundings if the expansion is at constant pressure or at constant temperature?
The answer in the book says W at constant temperature gives a greater value for the given case.
But when I...
Homework Statement
Homework EquationsThe Attempt at a Solution
I have tried to change mass of oxygen into mol and I got ratio of oxygen and nitrogen. And I don't really know what to do.
Homework Statement :[/B]
An astronaut visiting Jupiter’s satellite Europa leaves a canister of 1.20 mol of nitrogen gas 28.0 g/mol^2 at 25.0°C on the satellite’s surface. Europa has no significant atmosphere, and the acceleration due to gravity at its surface is 1.30 m/s2. The canister springs a...
Homework Statement
Let 3/2kT be the kinetic energy of ideal gas per molecules. T the absolute temperature and N the avogadro number. Answer the following questions :
1) when the volume doubled at constant temperature. How many times the kinetic energy per molecule become greater than before...
Hello,
As you can see in the attached hand drawing+calculation, my question concerns the typical method of evolved gas volume measurement by water displacement in an inverted graduated cylinder or "eudiometer". Once a bubble (cavity to be precise) of gas leaves the end of the tube through...
I purchased 22.752 gallons of gasoline containing +- 10% ethanol dispensing it into a 23 gallon gas tank. Then I drove 23 miles (mostly up hill) to a job site. At lunch time I was not able to crank the engine. The symptoms were clear, it was water in the gas. I have a video if you want to see...
Homework Statement
From a previous post in this forum, unfortunately the thread is closed for answers otherwise I would have posted it there: https://www.physicsforums.com/threads/thermodynamic-filling-of-tank-matlab.479112/
A 70 ft3 rigid insulated tank contains air at 14.7 psia and 80 º F...
Homework Statement
An ideal gas with molecules of mass m is contained in a cube with sides of area A. The pressure exerted by the gas on the top of the cube is P, and N molecules hit the top of the cube in a time
Δt. What is the average vertical component of the velocity of the gas...
Homework Statement
The problem is "A multicylinder gasoline engine in an airplane, operating at 2.40 10^3 rev/min, takes in energy 7.98 10^3 J and exhausts 4.50 10^3 J for each revolution of the crankshaft." and it wants me to find the liters of fuel consumed in 1 hr of operation if the heat...
I cannot find on google.
Can you give me examples of living beings that are in the from of gas like water vapour or smoke or anything else that is a gas.
Like jellyfish is made of water
Humans are solid
Homework Statement
A vessel contains a mix of helium and nitrogen (ideal gases). The ratio of the partial pressures is known: ##\frac{p_{N2}}{pHe} = 5##. The partial pressure is the pressure that a single component alone would exert.
Homework Equations
What is the value of ##\kappa = c_p/c_V##...
Homework Statement
Die average kinetic energy and impuls squared of a single molecule are:
$$<E_{kin}>= 6.5*10^{-21} J$$ and $$<p^2> = 1.8*10^{-45} kg^2m^2s^{-2}$$
Which gas ist it?
3. The Attempt at a Solution
##\frac{m<v^2>}{2}=\frac{<p^2>}{2m}## ##\Leftrightarrow## ##\frac{<p^2>}{<v^2>} =...
Hello,
I am trying to calculate the price of Liquid Gas of 1 TCF - My researce revealed to me that:
1 - I know that 100 cubic feet (Ccf) of natural gas equals 103,700 Btu or 1.037 therms
2 - I know that price per MMBtu multiplied by 1.037 equals price per Mcf
3 - The price of one MMBtu is...
We are trying to design a new product which uses gas pressures
in various ways. We are a little foxed about partial pressures:
Imagine a small cylinder; 6in long + 1in in diameter.
The cylinder is made from steel.
The cylinder is divided into two equal compartments – A and B.
Each compartment...
Hello, I would like to know, why is the volume of gas produced during phase change significantly more than the original volume of the liquid being used? Say water changing phase at 1atm.
We have a perfect gas in a closed box. On the top of the box there is a piston.
We know that the molecules of the gas exert a pressure on the piston.
Now let us put twice as many molecules in this tank, so as to double the
density, and let them have the same speed, i.e., the same temperature.
At...
Homework Statement
Consider a one-dimensional metal wire with one free electron per atom and an atomic spacing of ##d##. Calculate the Fermi temperature.
Homework Equations
Energy of a particle in a box of length ##L##: ##E_n = \frac{\pi^2 \hbar^2}{2 m L^2} n^2##
1D density of states...
My parents were driving over the weekend with the windows open and I came up with another bunch of questions. With the windows open, would you use more gas than with them closed? I figured that when the windows are open and wind is blowing in, the wind is pushing in the opposite direction that...
Homework Statement
If Cp for an ideal gas is 35.4 J/mol⋅K, which of the following is Cv for this gas?
a. 12.5 J/mol⋅K
b. 20.8 J/mol⋅K
c. 29.1 J/mol⋅K
d. 27.1 J/mol⋅K
e. 43.4 J/mol⋅K
Homework Equations
ΔH = ΔE + Δ(PV) = Q + W + Δ(PV), and for ideal gas, ΔH = nCvΔT + Δ(nRT) = nCvΔT + nRΔT =...
Homework Statement
Which of the following statement(s) is (are) correct when an ideal gas goes from an initial to a final state in a single process?
a. No work is done on or by the gas when the volume remains constant.
b. No energy is transferred into or out of the gas as heat transfer when the...
Homework Statement
Homework EquationsThe Attempt at a Solution
Honestly speaking , I have absolutely no idea about this problem .This doesn't happen often .In the KTG chapter , only definition and formula of Average , RMS and Most probable speeds is given .
This question is for an...
MODERATOR'S NOTE: Moved from other forum, so no template
@Chestermiller
I am still having trouble figuring out if a given process is Quasi-static or not.
Consider the following case. The cylinder consists of an ideal gas at the bottom and a liquid of density ρ at the top separated by a piston...
How many things can go wrong simultaneously and apparently independently with a gas central heating system? Mine has been stretching credulity to the limits last weekend.
Saturday afternoon, we noticed house getting cold and spotted that pilot light was out. Couldn't get it to relight at all...
1. The problem statement, all variables and given/known
Homework Equations
## \frac {PV1}{T1} = \frac {PV2}{T2} ##
The Attempt at a Solution
I find that v2 = 330/273 V1
But how can this related to the distance of P travel?
Also, as the A gas pressed to B, i think the B gas try to resist. But...
I was working at the observatory and uh someone came in with a question about landing in Jupiter- right away my brain was like no, it’s a gas giant and there’s too much pressure for a probe to make it to the solid surface, but I’ve also been trying to think of it in terms of the force applied by...
Do you know where I can find a formula to calculate how long it would take to drain a cylinder under pressure to atmospheric pressure? if I know the volume of the cylinder and the size of the opening.
Hi,
I am studying circular motion at the moment and we were asked to go away and find an example of a device which has a very large centripetal acceleration. Initially I found a washing machine has up to about 300g but then I was looking at nuclear enrichment gas centrifuges which have huge...
Hello!
Is there a table to show the equations that describe ideal gas processes?
For example, I know for isothermic, it's P1V1=P2V2, what about the others?
Also, how are these derived? Is it from Q-W=dU? or PV=nRT?
Any help?
thanks!
Homework Statement :
[/B]
A gas obeying the equation of state PV=RT undergoes a hypothetical reversible process
PV^\frac{5}{3} e^\frac{-PV}{E_0} = c_1 Can we prove that the thermal compressibility of the gas undergoing this process tends to a constant value at very high temperature? Here, E_0...
<<Moved from another forum, thus no template filled out.>>
I am having some trouble trying to relate a question given in my distance learning lessons to the equivelent question in my assignment.
The assignement question is:
1(a) Superheated steam at a pressure of 40 bar and a temperature of...
Homework Statement
This is a conceptual question.
An ideal gas is compressed to half its initial volume by means of several possible processes. Which of the following processes results in the most work done on the gas? a) isothermal b) adiabatic c) isobaric d) The work done is independent of...
I ran into this problem and need some guidance. Here's the question exactly as it appears in my sheet:
"A 500 kg rocket is set for vertical take-off. If the exhaust speed is 1,000 m/s, the mass of gas ejected per second to supply the thrust needed to overcome the weight of the rocket is:"...
Homework Statement
Hello, I will post a picture here of a question.
It states, a column of air is trapped by 5cm of mercury as shown.
What is the pressure in cm of mercury in the gas in each case?
Homework Equations
Pressure= h*g*rho
The Attempt at a Solution
I would use that equation but...
Because it is a closed space, can it make sense to fill a Calabi_Yau manifold with an ideal gas and consider waves from a point disturbance?
Would the Ricci-flat condition of Calabi-Yau manifolds have anything to say about possible sound waves?
Thanks!
I have a simulation I'm trying out (for fun). A self-gravitating ball of gas, in deep space. (The sim uses a fixed-time-step for each iteration.)
I'd like to use Boyles Ideal gas law, the force of gravity, and energy as internal heat. (I don't want to touch enthalpy unless I don't realize...
Homework Statement
A 3-ft^3 container is filled with 2-lbm of oxygen at a pressure of 80 psia. What is the temperature of the oxygen?Homework Equations
pV= nRT
T= PV/nR
R= 10.7316 psia x ft^3/ lbmol x R
The Attempt at a Solution
Hi everyone! So I understand how to use the Ideal Gas Law but my...