Quick Answer
For boiling water at high altitudes, adjust the temperature to 205°F (96°C) for every 1,000 feet (305 meters) of altitude gain. For example, at 5,000 feet, boil water at 235°F (118°C). This ensures proper water purification.
Altitude Adjustment Factors
Boiling water is essential for water purification, but high altitudes can affect the boiling point due to lower atmospheric pressure. The boiling point of water decreases by approximately 1.8°F (1°C) for every 1,000 feet (305 meters) of altitude gain. To adjust for this, you must increase the boiling temperature to ensure all pathogens and bacteria are killed.
The Ideal Boiling Temperature at High Altitudes
To determine the correct boiling temperature at a specific altitude, use the following formula: desired temperature in Fahrenheit (°F) is your typical boiling point of 212°F plus 1.8 times the number of thousands of feet above sea level. For example, at 10,000 feet, calculate 212°F + (1.8 * 10) = 232°F. This ensures all pathogens and bacteria are killed.
Boiling Water in Extreme Conditions
When boiling water in extreme conditions, such as in cold temperatures or with limited fuel, use a thermometer to monitor the temperature. This is crucial for high-altitude regions where the boiling point is lower. With a thermometer, you can accurately monitor the temperature and adjust the heat as needed to reach the desired temperature. This ensures proper water purification, even in challenging conditions.
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