Very important for the swelling behaviour Is the polar character of the water molecule. Experiments with nonpolar fluids like heptanor benzine showed no or only very small swelling.
同一岩样浸入极性和非极性的流体中，其膨胀性能是不同的，这与水分子的极化特性及其表面张力有关。
Artis had the idea of blasting the polar bear enclosure with artificial ow to encourage the natural behaviour of the bears, whose natural habitat is at the North Pole.
阿蒂斯动物园用人造雪布置熊舍的目的是为了鼓励这只北极熊的天性。
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