If we decrease the pressure of a substance, its boiling point decreases.

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Multiple Choice

If we decrease the pressure of a substance, its boiling point decreases.

Explanation:
Boiling point is the temperature at which a liquid’s vapor pressure equals the surrounding pressure. When you lower the surrounding pressure, that vapor-pressure balance is reached at a lower temperature, so the boiling point drops. That’s why liquids boil at lower temperatures on mountains or in a vacuum, and why increasing pressure would raise the boiling point. So, the statement that decreasing pressure lowers the boiling point is correct.

Boiling point is the temperature at which a liquid’s vapor pressure equals the surrounding pressure. When you lower the surrounding pressure, that vapor-pressure balance is reached at a lower temperature, so the boiling point drops. That’s why liquids boil at lower temperatures on mountains or in a vacuum, and why increasing pressure would raise the boiling point. So, the statement that decreasing pressure lowers the boiling point is correct.

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