Question

Water boils at lower temperature on high altitudes because
1. Atmospheric pressure is low there
2. Atmospheric pressure is hight there
3. Water has weak hydrogen bonds
4. Water is pure form is found there

Answer 1

Correct Answer - Option 1 : Atmospheric pressure is low there

Concept:

• The force per unit area is called as pressure.
• As we go on higher altitudes the atmospheric pressure decreases.
• The heat required to change the phase of any substance without changing the temperature is called as latent heat of that substance.
• The temperature at which water starts boiling is called as boiling temperature of water.

Explanation:

• When we go on higher altitudes then the atmospheric pressure decreases.

• Due to decrease in atmospheric pressure it takes less energy to bring the water at their boiling point.
• Hence due to less energy needed, the water boils at lower temperature.
• Unlike Pressure Cooking where the boiling point is higher, the higher-altitude cooking is accompanied by lower/decreased atmospheric pressure.
• This requires more cooking time.
• Water boils at 212º F at sea level. 
• At higher altitudes, the boiling point of water decreases, which leads to longer cooking times.