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1.5 Water: Temperature and Heating Equipment

Objectives

  • Relate descriptive temperature terms to the observable changes in water at various temperatures.
  • Compare heating equipment and determine the best uses for each.

Commonly used water temperatures in an open (regular) saucepan

Lukewarm temperature (30–37°C;            °F)

  1. Does lukewarm water feel warm or cool to the touch?
  2. What is normal body temperature?

                   °C;                    °F.

 

Simmering temperature (85–99°C; _____°F)

  1. Describe the surface appearance of simmering water:

 

 

Boiling temperature (100°C;           °F)

  1. Describe the surface appearance of water at… a slow boil:
  2. …a rapid (rolling or fast) boil:

 

 

Fast or Slow Boil

  1. What are the advantages of cooking foods at a slow boil rather than a fast boil?
  2. What are the advantages of cooking foods at a fast boil rather than a slow boil?
  3. When might water boil at less than 100°C; or more than 100°C?

Double Boiler

  1. What happens if there is too much water in the bottom of the double boiler?
  2. List appropriate uses for a double boiler:

 

Steamer

  1. How would the rate at which foods cook in a steamer compare to the rate in a saucepan? Explain.
  2. List appropriate uses for a steamer:

 

 

Pressure Saucepan or Cooker

  1. At what temperature does water boil under:
    • 5 lbs. pressure?                   109°C;                        °F.
    • 10 lbs. pressure?                          °C;              240°F.
    • 15 lbs. pressure?                   121°C;                        °F.
  1. How would the rate at which foods cook in a pressure saucepan compare to the rate at which they cook in a regular saucepan? Explain.
  2. Temperature decreases by 1°C for each 960-foot increase in altitude. At what temperature would water boil in Denver, Colorado (altitude approximately 5,000 feet above sea level)?

                         °C;                        °F.

  1. List appropriate uses for a pressure saucepan.

 

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Food Preparation Lab Manual for FSHN 1150 Copyright © 2025 by Iowa State University Department of Food Science and Human Nutrition is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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