Mechanical Engineering - Thermodynamics - Discussion
Discussion Forum : Thermodynamics - Section 1 (Q.No. 9)
9.
When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.
Discussion:
27 comments Page 2 of 3.
Manoj said:
1 decade ago
But w= pdv is true only for reversible process.
Dr. Aayush Gupta and Dr. Rajkiran Shrivastav said:
1 decade ago
Since we have considered a reversible process and closed system, in which work done = pdv, but at constant volume pdv work done is zero.
By first law of thermodynamics we have,
q = du + w,
therefore q=du.
By first law of thermodynamics we have,
q = du + w,
therefore q=du.
Purusottam said:
1 decade ago
In constant volume process change in volume is zero. So boundary work Pdv is zero. from first law,
dq=du+dw, dw=0.
So dq=du, hence heat supply increases internal energy.
dq=du+dw, dw=0.
So dq=du, hence heat supply increases internal energy.
Rakesh Kumar Maurya said:
1 decade ago
Constant volume means, no work obtained by object because of volume change is not possible by internal energy change.
(1)
Uttam kumar said:
1 decade ago
I can't understand que. In case of inter energy, they get increase but how the supplied energy get increase?
Uttam kumar said:
1 decade ago
Collision between the atoms also be responsible for increase in internal energy. If external energy are supplied.
Amar Dev said:
1 decade ago
Heat supplied = Work done + Change in internal energy.
dQ = W + dU.
dQ = PdV + dU [dV(change in volume) = 0 in case of constant volume].
So dQ = dU.
dQ = W + dU.
dQ = PdV + dU [dV(change in volume) = 0 in case of constant volume].
So dQ = dU.
Anil said:
1 decade ago
No pressure change means no work. In this case heat supplied is =internal energy. From 1st law.
ROHIT KUMAR said:
1 decade ago
We know that in constant volume process volumes remain constant. So work done = 0.
Now,
DQ = dU+DW.
DW = 0.
So DQ = dU.
So heat supplied in constant volume process is used to increase it's internal energy.
Now,
DQ = dU+DW.
DW = 0.
So DQ = dU.
So heat supplied in constant volume process is used to increase it's internal energy.
Kunwar singh said:
1 decade ago
If we heat at a constant volume then W=O.
And according to thermodynamics first law:
dQ = dU+dW.
dQ = dU.
Then it heat supplied will be increase then it internal energy automatically increase because it final temperature will be increase.
And according to thermodynamics first law:
dQ = dU+dW.
dQ = dU.
Then it heat supplied will be increase then it internal energy automatically increase because it final temperature will be increase.
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