Question:
In an isothermal process, which of the following remains constant?
In an isothermal process, which of the following remains constant?
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Remember that in any isothermal process, the system's temperature does not change, which is a key factor in understanding and solving related problems.
Updated On: Jun 3, 2026
- Temperature
- Pressure
- Volume
- Heat
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The Correct Option is A
Solution and Explanation
Step 1: Concept
An isothermal process is a thermodynamic process that occurs at a constant temperature. In such processes, the system exchanges heat with its surroundings to maintain a constant temperature.
Step 2: Meaning
The term "isothermal" comes from the Greek words "iso," meaning equal or same, and "thermos," meaning heat. Thus, an isothermal process maintains a uniform temperature throughout the process.
Step 3: Analysis
In an isothermal process: The temperature remains unchanged. Heat is exchanged with the surroundings to keep the internal energy constant since $dU = 0$ for an ideal gas in such processes (where $dU = nC_v dT$, and $dT = 0$). The other options are analyzed as follows: Pressure: Does not necessarily remain constant. It can change depending on volume changes. Volume: Can vary, but the process is defined by maintaining a constant temperature. Heat: The system exchanges heat with its surroundings to maintain the temperature constant. Therefore, in an isothermal process, only the temperature remains constant.
Step 4: Conclusion
The correct answer is A) Temperature as it is the defining characteristic of an isothermal process.
Final Answer: (A)
An isothermal process is a thermodynamic process that occurs at a constant temperature. In such processes, the system exchanges heat with its surroundings to maintain a constant temperature.
Step 2: Meaning
The term "isothermal" comes from the Greek words "iso," meaning equal or same, and "thermos," meaning heat. Thus, an isothermal process maintains a uniform temperature throughout the process.
Step 3: Analysis
In an isothermal process: The temperature remains unchanged. Heat is exchanged with the surroundings to keep the internal energy constant since $dU = 0$ for an ideal gas in such processes (where $dU = nC_v dT$, and $dT = 0$). The other options are analyzed as follows: Pressure: Does not necessarily remain constant. It can change depending on volume changes. Volume: Can vary, but the process is defined by maintaining a constant temperature. Heat: The system exchanges heat with its surroundings to maintain the temperature constant. Therefore, in an isothermal process, only the temperature remains constant.
Step 4: Conclusion
The correct answer is A) Temperature as it is the defining characteristic of an isothermal process.
Final Answer: (A)
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