Boiling point is defined as the temperature at which the vapor pressure of a liquid equals the surrounding atmospheric pressure. When the atmospheric pressure is lowered, the liquid needs to reach a lower vapor pressure to start boiling. Since vapor pressure increases with temperature, a lower required vapor pressure is achieved at a lower temperature. Therefore, lowering the atmospheric pressure on a liquid lowers its boiling point.
Lowering the atmospheric pressure on a liquid
Asked in UPSC CAPF 2018 · Topic: Heat and Thermodynamics (Phase Transitions and Clausius-Clapeyron Equation)
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Answer: B. lowers the boiling point of the liquid
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