* Atmospheric pressure: Air pressure decreases as altitude increases. At higher altitudes, like mountain tops, there is less atmospheric pressure pushing down on the water.
* Boiling point and pressure: Water boils when its vapor pressure equals the surrounding atmospheric pressure. Since the pressure is lower on a mountain top, the water needs less energy (and therefore a lower temperature) to reach its boiling point.
In summary:
* Sea level: Water boils at 100°C (212°F) due to standard atmospheric pressure.
* Mountain top: Water boils at a lower temperature than 100°C (212°F) due to the lower atmospheric pressure. The exact boiling point depends on the altitude.
Here's an example:
* At the summit of Mount Everest (8,848 meters or 29,032 feet), water boils at approximately 69°C (156°F).
This difference in boiling point is why it's harder to cook food at high altitudes. The lower boiling point means that food takes longer to cook because the water isn't reaching the necessary temperature for proper cooking.
