Thermometer for measuring soil temperatures

Thermometer for measuring soil temperatures

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Credit: JERRY MASON/SCIENCE PHOTO LIBRARY

Caption: Soil thermometer. Thermometer stuck in the ground to measure the temperature of the soil. The thermometer consists of a narrow tube connected to a reservoir containing mercury (red). The mercury expands as it warms, forcing the liquid level up the tube. The liquid level can then be compared with a marked scale to show the temperature. The temperature of the soil changes much more slowly than that of the air. Some plants are not adapted to live in a cold climate, therefore it is important to know the soil temperature before moving plants from a warm environment, such as a greenhouse, into the open air.

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Keywords: agricultural, agriculture, farming, land use, mechanised, mechanized, mercury thermometer, soil, soil thermometer, temperature measurement, thermometer

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