For causing an expansion in an ideal piston-cylinder system, we add heat to the system. As a consequence our system will produce a certain amount of work. This is work done by our system. To compress air in the cylinder a certain amount of work must me done on the system, therefore thermal energy will be released by the system (1st law of thermodynamics). What you were saying is that the temperature decreases in the system during expansion. Ofcourse I am talking about a non-adiabatic system. If we talk about an adiabatic system and we let the gas expand, this expansion must be compensated by a decrease in temperature (see adiabatic process with decrease in pressure). How I understand entropy is: Entropy tells us something about the quality of energy. An increase in entropy is a decrease in the quality of the energy. Energy of the highest quality is work as it can (almost) totally be converted to heat. The reverse isn't the same as converting heat to work must be done with heat engines. If a system generates a big amount of entropy, it actually means that the thermal efficiency of the system is quite low and produces a lot of waste energy. If the generated entropy of the system equals to zero, we have an efficiency of an ideal heat engine (which is quite difficult to achieve because of the irreversibilities). In this case the expansion did useful work. The energy that is used to do this work cannot be used anymore, hence an increase in entropy. Correct me if I'm wrong. It's quite confusing without mentioning these important things. Thank you!
I think, when one says, "entropy is the amount of disorder in the system", I think one has to add, "on an atomic scale", otherwise it will be misleading because a glass of water looks more ordered than a bunch randomly shaped ice in the same glass, but we know the glass of water has higher entropy.
Sir can you explain the basic concept of heat and temp how i differentiate them as i think temp is an unit that measures the hotness or coldness of a body and heat is form of energy that contains volume (nos of molecules) at specific temperature (ex 100°c) as we increase the volume(nos of molecules) at same temperature (100°c) is that mean we increase the heat ?????? Plz clear me anyone
I think If we supply high temprature then we get high amount of work Due to that less heat flow would be avilable at sink(T2) due to that entalpy per unit mass would be would be less So we have high entropy at high temperature
There was a small misunderstanding by the way... entropy(disorder / randomness ) increases with increase in entropy...moreover his explanation based on pressure and volume was valid....
How u say that sir That if temp falls from T1 to T2 and Volume will decrease. If u change pressure And temperature also less so if temp less how entopy becomes greater plz explain?
overall your lectures are good... but this comprehension has some flaws in it. being a lecturer of physics i can tell you what are those problems. if you will ask me then.
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For causing an expansion in an ideal piston-cylinder system, we add heat to the system. As a consequence our system will produce a certain amount of work. This is work done by our system. To compress air in the cylinder a certain amount of work must me done on the system, therefore thermal energy will be released by the system (1st law of thermodynamics). What you were saying is that the temperature decreases in the system during expansion. Ofcourse I am talking about a non-adiabatic system. If we talk about an adiabatic system and we let the gas expand, this expansion must be compensated by a decrease in temperature (see adiabatic process with decrease in pressure).
How I understand entropy is: Entropy tells us something about the quality of energy. An increase in entropy is a decrease in the quality of the energy. Energy of the highest quality is work as it can (almost) totally be converted to heat. The reverse isn't the same as converting heat to work must be done with heat engines. If a system generates a big amount of entropy, it actually means that the thermal efficiency of the system is quite low and produces a lot of waste energy. If the generated entropy of the system equals to zero, we have an efficiency of an ideal heat engine (which is quite difficult to achieve because of the irreversibilities). In this case the expansion did useful work. The energy that is used to do this work cannot be used anymore, hence an increase in entropy. Correct me if I'm wrong. It's quite confusing without mentioning these important things. Thank you!
I think, when one says, "entropy is the amount of disorder in the system", I think one has to add, "on an atomic scale", otherwise it will be misleading because a glass of water looks more ordered than a bunch randomly shaped ice in the same glass, but we know the glass of water has higher entropy.
Sir your way of teaching is quite good. Keep it up. Your efforts help us to understand topic in depth👍
#Mechanicaltutor
no one can teach like pradeep sir
Temperature determines the direction of a thermodynamic process.
Sir can you explain the basic concept of heat and temp how i differentiate them as i think temp is an unit that measures the hotness or coldness of a body and heat is form of energy that contains volume (nos of molecules) at specific temperature (ex 100°c) as we increase the volume(nos of molecules) at same temperature (100°c) is that mean we increase the heat ?????? Plz clear me anyone
Thanks for your video I understood sir
Can u brief introduction of enthalpy
How to tell heat and pressure combined as enthalpy?
Rectification - entropy is directly propertional to temperature
wrong thought
I think
If we supply high temprature then we get high amount of work
Due to that less heat flow would be avilable at sink(T2) due to that entalpy per unit mass would be would be less
So we have high entropy at high temperature
Index of unavailability degerataion of energy is called as entropy
Amazing
HELPED A LOT
V.gowtham
Mech B
Lateral entry
You are Awesome sir... understanding the Concept Very very very nicely... Thank you so much ❤️❤️❤️❤️❤️❤️❤️❤️
Very well explained..... helped a lot.. thanks sir
Be clear about ur concept
sir please say what is an entropy
Simply it is "the hidden energy of the fluid"
@@kvsalahuddin5 thank u sir..ur definition is perfect..🙂
There was a small misunderstanding by the way... entropy(disorder / randomness ) increases with increase in entropy...moreover his explanation based on pressure and volume was valid....
Can you tell me please your property diagram process is feasible or not?
ua-cam.com/video/aXkw2Xrfbr4/v-deo.html👍
🙏🙏🙏🙏
U confused me how temp is inversely proportional to entropy???
Same case bro
How it is?
Gibbs Energy equation states that
From second law of thermodynamics state that S=klogw.you can find out your answer.
Because deals with second law of thermodynamics sink to source
Because (Delta S)=Q/T, therefore S is proportional to 1/T where Q is the proportionality constant.
tq sir
You are great
Plz pradeep sir come to teach entropy
way entropy increase less while temperature is higyh
only Pradeep Sir can teach it
Supper teaching sir tq
While going from s2 to s1 entropy doesn't decrease. it always increase
the entropy of a system can decrease, its the entropy of the whole universe the one that will always increase.
Thank u for lessoned me sir
❤🙏🙏
S=Kb loge(n).
[Entropy].
Rajakarthikeyan
Mech B
Later entry
How u say that sir
That if temp falls from T1 to T2 and
Volume will decrease.
If u change pressure
And temperature also less so if temp less how entopy becomes greater plz explain?
same question here lol
Ahmad bhai 👍👍
Thanks
Your a big help
overall your lectures are good... but this comprehension has some flaws in it. being a lecturer of physics i can tell you what are those problems. if you will ask me then.
great work
thanks sir
sir, maintain clear videos, without seeing how can we understand'
Video is clear but you are not watching in good quality....