Charles's law predicts that a gas cooled at constant pressure would reach zero volume at
Correct answer: C. -273.15 degrees C
- A. 0 degrees C
- B. -100 degrees C
- C. -273.15 degrees C
- D. -373 degrees C
Explanation
Extrapolating the straight line of volume against temperature backwards, every gas reaches zero volume at minus 273.15 degrees Celsius, which is defined as absolute zero or 0 K. The extrapolation is theoretical, since every real gas liquefies well before that point. This is precisely why the Kelvin scale exists and why gas law calculations must use it.
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About Absolute Zero
Absolute zero is 0 K, equal to −273.15°C, the lowest theoretical temperature on the Kelvin scale. The topic covers the relationship between temperature and molecular motion, the extrapolation of gas volume or pressure to zero, and why absolute zero cannot be reached experimentally, although particles retain quantum zero-point energy.
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