Elizabeth says that the boiling temperature of water decreases when the water is under reduced pressure. Austin says the opposite is true—that reduced pressure increases the boiling point. Whom do you agree with and why?
To identify: Whether person A or person E is correct.
Answer to Problem 47A
Person E is correct because on reducing pressure boiling temperature decreases.
Explanation of Solution
Introduction:
Boiling point is that temperature above which a substance changes its state from liquid to gas at that particular pressure. Boiling point of water at atmospheric pressure is
As the pressure decreases, the molecules of the substance becomes far from each other. Thus, it requires less energy to expand to the gaseous state. So the temperature required to change the state decreases and hence the boiling point of water decreases with the decrease in pressure on it.
Conclusion:
Therefore, person E is correct.
Chapter 23 Solutions
Conceptual Physics: The High School Physics Program
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