In a thermally insulated container was a mixture of ice and water. Then we have put a immersion heater ( P=400W). We started measure time and at the end of every minute we writed down the heat od mixture. First two minutes the heat wasn't changing, at the end of third it raised about 2°C, at the...
I am writing an essay on "Ziemlich Frech : Einstein versus Nernst".
I can find very little information on this topic anywhere. I've searched the library and the internet and don't have anything certain yet.
So far I'm at a stage where I believe it could be about Einstein Solids. I know that...
According to the j-t effect the decrease in the temperature is a result of the work done by molecule to expand thus increasing their PE and decreasing their KE, but in the linde process the next step is liquification, i am having trouble understanding how it happens, since the intermolecular...
Homework Statement
Consider a monatomic ideal gas that lives at a height z above sea level, so each molecule has potential energy mgz in addition to its kinetic energy.
(a) Show that the chemical potential is the same as if the gas were at sea level, plus an additional term mgz:
μ(z) =...
Homework Statement
A liter of air, initially at room temperature and atmospheric pressure, is heated at constant pressure until it doubles in volume. Calculate the increase in its entropy during this process.
so Ti= 300K, Volume which is 2Vi=Vf; Pressure is constant
Homework Equations
ΔS...
If in a non-quasistatic process the pressure is constant, is the work necessarily equal to cero?
I have from the notes taken in class that it must be 0, but I don't really see why, so I'm not sure whether maybe I didn't hear it well.
I haven't really started to work with non-quasistatic...
1) PROBLEM:
Task is to find the thermal conductivity of steel experimentally.
I have conducted relevant experiments and I am trying to solve for the thermal conductivity (k) itself. My final however is ten times too large in size, and I am having trouble identifying where the error is coming...
Right, I'm sure this is bread and butter to a lot of you but I have just been introduced to the SFEE.
mgz+0.5mC^2+H +Q = mgz + 0.5mC^2 +H+W
Where Q is the heat transfer, W is work done and H is enthalpy. Where is it assumed that the heat energy is in the energy balance? If heat is added where...
Consider an ideal gas. For a polytropic process we have ##PV^n = const##. Different values of ##n## will represent different processes; for example isobaric (##n=0##), isothermal (##n=1##), and isochoric (##n=\infty##).
The Wikipedia article on polytropic processes states that the specific heat...
Hi I'm new to this site, so I'm not sure where to post this question but chemistry seemed fitting.
I'm current taking 2 thermo classes, engineering and chemistry, and I'm having trouble with the concept of enthalpy.
This is what I believe I understand. I Hope the following is all correct if...
Homework Statement
http://puu.sh/c0rhe/fb6b48f890.png [Broken]
Homework Equations
PV=constant
The Attempt at a Solution
I have no idea how to apply the above equation. Please help.[/B]
Homework Statement
Homework Equations
Conceptual qn
The Attempt at a Solution
work is done in gas but how can internal energy change?
there is no heat flow since it is an adiabatic process[/B]
Homework Statement
I have been given a description of a thermodynamic cycle that looks like this. I have two polytropic processes (n1=1.2, n2=1.9), and one isochoric. The known data are:
p1 = 1 bar
T1 = 15 °C
p2 = 15 bar
Homework Equations
p v^(1.2) = 0.7958
p v^(1.9) = 0.69657
The Attempt...
Looking for some information on how a shrink fit collar actually works. I get the basic principle that you heat it, it expands, fit the collar, let it cool and it contracts and grips as a collar.
However, if you heat a material am I right in saying that it expands in all direction. If this is...
Homework Statement
2. The attempt at a solution
Is it only possible when 600J of heat is exhausted and 400J of heat is converted into work? Is the 600J heat will enter the cold reservoir and available to do work again?
q1/T hot + q3 / T cold = 0
q3 = 600 when T = 300K