The boiling point of water increases with depth because...

The boiling point of water increases with depth because pressure increases with depth. At what depth will fresh water have a boiling point of $150^{\circ} \mathrm{C}$, if the surface of the water is at sea level?

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Key Concepts

Phase Change Equilibrium

Phase change equilibrium involves the balance between the vapor pressure of a liquid and the surrounding pressure. When these pressures are equal, the liquid reaches its boiling point and transitions into a gaseous state. Changes in external pressure, such as those due to increasing depth underwater, directly impact the temperature required for boiling.

Hydrostatic Pressure

Hydrostatic pressure is the pressure exerted by a fluid due to the force of gravity. It increases linearly with depth in a fluid, as given by the formula p = p? + ?gh, where p? is the surface pressure, ? is the density of the fluid, g is the acceleration due to gravity, and h is the depth. This concept explains why pressure increases with depth underwater.

Boiling Point

The boiling point of a liquid is the temperature at which its vapor pressure equals the external or ambient pressure. This defines the condition when the liquid starts to transition into a gas. For water at standard atmospheric pressure, the boiling point is 100°C, but when the external pressure changes, so does the boiling point.

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