Physical Constants
The value of the universal gas constant R depends upon:
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About This Question
- Subject
- physics
- Chapter
- units and measurements
- Topic
- physical constants
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Units of measurement
- Definition: R is a 'Universal' constant, meaning it remains exactly the same for all ideal gases regardless of context.
- Constancy: It does not vary with temperature, pressure, or the specific chemical nature of the gas.
- Numerical Dependence: Its numerical representation changes only if we change the units (e.g., 8.314 J/mol K vs 0.0821 L-atm/mol K).
- Conclusion: The magnitude depends strictly on the system of units selected.
This easy difficulty physics question is from the chapter units and measurements, covering the topic of physical constants. It appeared in the 2025 exam.
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