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。
2.
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。
3.
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。
