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The temperature of a body of water strongly influences the amount and diversity of its aquatic life. Bodies of water tend to create more plant life when their temperatures are higher. Many fish and other aquatic animals also spawn when the temperature of water rises and food is more abundant.
How to Measure Water Temperature
Students must first tie the string to one end of the thermometer and then tie the other end to a rubber band. Students should wear the rubber band around their wrists in case the string slips and falls. Before immersing the thermometer in the water, students must first shake it several times to remove any air bubbles. Students can then immerse the thermometer into the water sample to a depth of 10 cm for three to five minutes. Students must be sure to take the reading immediately after raising the thermometer from the water so that the outside environment does not affect its temperature. If possible, take the reading while the thermometer is still immersed in the water. Take a second reading and if the temperature is unchanged, record that number. Be sure to leave the thermometer in the water for exactly the same amount of time for both measurements.
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Alcohol-filled thermometer
A clock or watch
String
Rubber Band
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Be sure to use environmentally safe alcohol-filled thermometers and do not use mercury-filled thermometers.
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1) Students gently lower the thermometer into the water sample to a depth of 10 cm.
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2) Students time the submersion of the thermometer for three to five minutes.
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3) A student records his data.
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![Protocols [Image: Blue-Eyed Grass]](images/protocols_h.jpg)
