What happens to the boiling point of water as you climb higher up a mountain?

As you climb higher up a mountain, the boiling point of water decreases. This is due to the decrease in atmospheric pressure at higher altitudes.

Here are the steps to understand this:

1. At sea level, the atmospheric pressure is highest because the air molecules are most densely packed. This high pressure is what keeps water boiling at 100 degrees Celsius (212 degrees Fahrenheit).

2. As you climb a mountain, the atmospheric pressure decreases because the air molecules are less densely packed. This is due to the fact that there is less air above you to exert pressure.

3. The decrease in atmospheric pressure means that it takes less energy (or heat) to make water boil. Therefore, the temperature at which water boils decreases as you go higher up the mountain.

4. For example, at the top of Mount Everest, the highest point on Earth, the boiling point of water is only about 70 degrees Celsius (158 degrees Fahrenheit), compared to 100 degrees Celsius (212 degrees Fahrenheit) at sea level.

5. This is why it can be difficult to cook food at high altitudes, because the lower boiling point of water means that foods cooked in water (like pasta or rice) will cook at a lower temperature, and therefore take longer to cook.