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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Mason, Jerry |
Bildgröße: | 2436 px × 3566 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |