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Shweta Thakur posted an Question

July 06, 2020 • 22:44 pm

30 points

IIT JAM
Chemistry (CY)

Plz tell about real boundary and imaginary boundary which separate system and surrounding

plz tell about real boundary and imaginary boundary which separate system and surrounding

3 Answer(s)

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Dinesh khalmaniya 1

hope this will help you 🙏
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Dinesh khalmaniya 1

The boundary is simply a surface around the volume of interest. Anything that passes across the boundary that effects a change in the internal energy needs to be accounted for in the energy balance equation. The volume can be the region surrounding a single atom resonating energy, as Max Planck defined in 1900; it can be a body of steam or air in a steam engine, such as Sadi Carnot defined in 1824; it can be the body of a tropical cyclone, such as Kerry Emanuel theorized in 1986 in the field of atmospheric thermodynamics; it could also be just one nuclide (i.e. a system of quarks) as hypothesized in quantum thermodynamics. Boundaries are of four types: fixed, moveable, real, and imaginary. For example, in an engine, a fixed boundary means the piston is locked at its position; then a constant volume process occurs, no work being permitted. In that same engine, a moveable boundary allows the piston to move in and out, permitting work. For closed systems, boundaries are real while for open system boundaries are often imaginary
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Dinesh khalmaniya 1

check it
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Suman Kumar

Boundary" separates the system from the surrounding and, in the case of a system, say a glass of water, there is an imaginary boundary on top of the surface of water. While you may also consider that the glass itself acts as a real boundary in the same example.
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Priyanshu kumar

this much helps shweta....just take example around yourself and imagine😊
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Priyanshu kumar

this too imagine the example
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Priyanshu kumar

System" refers to the area you're studying in regard to heat changes. "Boundary" separates the system from the surrounding and, in the case of a system, say a glass of water, there is an imaginary boundary on top of the surface of water. While you may also consider that the glass itself acts as a real boundary in the same example
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sir is there any problem because i am not able to send u any query here
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no shweta i'm seeing your query
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I have written same comment two times
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Priyanshu kumar Best Answer

Imagine you're in a room with the door closed. Say, you are measuring the temperature of the room, i.e. the room is your system. In that case, it's easy to understand that the boundaries are real. In this case, the walls, the ceiling, the closed door comprises the boundary of the system. Now, say somebody opens the door. Understand that this does not change the system; you are still interested in measuring the temperature of the room only. So, we can say that at the place of the closed door, there is an imaginary boundary. By specifying the boundary, you are now able to define your system more clearly. read this
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In a thermodynamic analysis, the system is the subject of the investigation. A boundary is a closed surface surrounding a system through which energy and mass may enter or leave the system. Everything external to the system is the surroundings.....read thermodynamic defn
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shweta if you are reading thermodynamics ...follow kl kapoor volume 2 as reference book
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sir I have done thermodynamics just m revising
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oo good ...keep it up👍😊
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sir plz wait
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