boiling point
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A boiling point is the temperature at which a liquid turns into a gas or vapor. It matters because knowing when this happens helps us understand how substances behave, control cooking and industrial processes, and predict how materials will perform under different conditions.
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Water boiling at 99.3 °C (210.8 °F) at 215 m (705 ft) elevation The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum, i.e., under a lower pressure, has a lower boiling point than when that liquid is at atmospheric pressure. Because of this, water boils at 100°C (or with scientific precision: 99.97 °C (211.95 °F)) under standard pressure at sea level, but at 93.4 °C (200.1 °F) at 1,905 metres (6,250 ft) altitude. For a given pressure, different liquids will boil at different temperatures.