Potometer an apparantus for measuring the rate of water uptake by a cut shoot or whole plant 蒸腾计：通过茎切段或整个植物体来测量水分吸收速率的仪器。
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This is normally closely related to the rate of water loss by transpiration , and the potometer can be used to compare transpiration rates under different conditions 通常与由于蒸腾作用而丧失水分的速率紧密相关，蒸腾计可被用于在不同条件下进行蒸腾速率的比较。
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More meaningful comparisons can be made by comparing water loss from the potometer with that from an atmometer ( an apparatus used to measure the rate of evaporation from a porous pot or other nonliving wet surface ) , which allows uncontrolled evaporation 更有意义的是，可以比较蒸腾计的失水与蒸发计（通过有孔小罐或者潮湿表面来测量蒸发速率的仪器）的失水间的区别。
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