What is the difference with cooking directions & high altitude directions printed at the back of a box rice?

Question

In additon to this question, why should the direction depend on the altitude in this way?

Answer 1

The boiling temperature of water is slightly lower at higher altitudes. More importantly, it is related to the barometric pressure which is lower at higher altitudes but can also vary depending on the weather.

For instance, in Denver the barometric pressure is currently 30.08 and the altitude is 5280 feet. The boiling temperature of water is 202.7°F.

Because the boiling temperature is lower, it takes longer to cook food because there is less heat to cook it. You can see the effects of higher pressure when you cook by placing a glass cover over a pot of water that you want to boil. You will notice it boil sooner, however if you take the lid off after it starts to boil it will stop boiling because you have let the steam out and the pressure will have dropped.

Answer 2

The higher the altitude, the lower the air pressure (less air stacked above you). If the pressure is lower, water will boil at a lower temp. Since cooking of food is based upon exposure to a tempurature for a period of time - a lower boiling point (and therefore lower temp) would require you to cook longer.

Answer 3

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Answer 4

In higher elevations, water boils at a lower temperature. Since the temp is lower, you need to boil longer.