2. At sea level, the boiling point of water is 212°F. On top of Mt. Everest (a little more than 29,000 ft above sea level), the boiling point of water is roughly 160°F. Using the numbers given, write the simplest form of the rational algebraic expression, showing the decrease in temperature to the increase in height. Note: A decrease of 9.5°F per mile up the sea level is the actual rate.

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Boiling point refers to the temperature where the vapor pressure of a liquid substance becomes the same with the external pressure surrounding the liquid. This means that the boiling point of a liquid substance is dependent on atmospheric pressure.

Atmospheric Pressure

Atmospheric pressure is the force per unit area exerted by the weight of the air to the surface or substance below it.

Relationship of Boiling Point, Atmospheric Pressure, and Elevation

Boiling point and atmospheric pressure decreases as the elevation increases. The main reason behind this is because air is less dense at higher altitudes, meaning they have low atmospheric pressure at higher altitudes.

Since the atmospheric pressure is lower at elevated areas, this means that the vapor pressure of the liquid is also lowered in order to reach its boiling point, hence, boiling point would also be lower at higher altitude.