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Chapter 3: Q18-30DQ (page 610)

In addition to the normal cooking directions printed on the back of a box of rice, there are also 鈥渉igh-altitude directions.鈥� The only difference is that the 鈥渉igh-altitude directions鈥� suggest increasing the cooking time and using a greater volume of boiling water in which to cook the rice. Why should the directions depend on the altitude in this way?

Short Answer

Expert verified

At high altitudes, water boils at low pressure with a lesser temperature and needs more boiling time.

Step by step solution

01

Definition of boiling point

It is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure.

The boiling temperature is dependent on the atmospheric pressure.

The lesser the pressure, the lower the boiling temperature.

02

Boiling at a high altitude  

With an increase in height from the surface of the earth, the pressure decreases.

At lesser pressure in higher altitudes, the boiling point is less as the water boils at a low temperature, which requires more cooking time with sufficient (more) water for cooking the same rice.

Thus, the 鈥渉igh-altitude directions鈥� suggest increasing the cooking time and using a greater volume of water to cook the rice.

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