KM asked in Science & MathematicsChemistry · 9 months ago

# What will happen to the boiling point of water if it is boiled in the deep valley and why?

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• Jim
Lv 7
9 months ago

The lower the elevation, the more air pressure, which raises the boiling point temperature.

The lower you go, the more the air pressure acts more like a Pressure Cooker.

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extra

tri·ple point: the temperature and pressure at which water is solid, liquid, and vapor phases of a pure substance can coexist in equilibrium.

It's water, ice and boiling all at the same time!

• Bill-M
Lv 7
9 months ago

Boiling point of water changes with Altitude above Sea Level. The Higher in altitude you go the lower the boiling point. At sea level, water boils at 100 °C (212 °F). For every 500-foot (150 m) increase in elevation, water's boiling point is lowered by approximately 0.5 °C. At 8,000 feet (2,400 m) in elevation, water boils at just 92 °C (198 °F).

• 9 months ago

If the valley is deep enough to make the air pressure observably greater than the average air pressure at sea level, the water will boil at a slightly higher temperature than 212° F.

Contrariwise, water boils at lower temperatures the higher you go into the mountains, because the air pressure is lower. Cooks there have to adjust cooking times. It takes longer to boil an egg to the same degree of doneness.

• 9 months ago

Water will boil at a higher temperature in a deep valley than at sea level. It does this because, on average, the atm pressure is higher at the lower level. Which means the partial pressure of the water is higher at its surface so more energy (heat) is needed to form the bubbles we note as boiling.

Note, the reverse is true when we climb a mountain. The water (bubbles) will boil at a lower temperature because the atm pressure is lower than at sea level. Which means it takes less heat than usual to form those bubbles.

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• 9 months ago

As the valley gets deeper the atmospheric pressure increases. Boiling point is defined as the temperature at which the vapor pressure of water equals the atmospheric pressure. The vapor pressure of water increases as its temperature increases. So as the atmospheric pressure increases, so does the boiling point.

• 9 months ago

Explorers in the olden days used to use a thermometer to determine altitude! The higher you are, the less atmospheric pressure, so water boils at a lower temperature. By the temperature where water begins to boil you can measure the air pressure, and so the altitude.

Below sea level, water will boil at a higher temperature because there's more air pressure holding the water together.