我們有一題考試是將考的 不知道題目有沒有記對>< When a celery stalk is put in water, it becomes round and hard. The same stalk is put into salt water, it starts to shrink. The celery stalk is 然後他的答案是 hypertonic in water and hypotonic is salt water 我不懂為什麼.... 不是如果變圓變大就是hypotonic嗎? 然後放在鹽水裡是會變小所以是hypertonic 為什麼是相反的呢>< 有沒有大大可以教一下的.... Thanks~~ --

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