Why are the volume markings on [this drip](https://en.m.wikipedia.org/wiki/Saline_(medicine)#/media/File%3ANaCl_0%2C9%25_500ml_white_background.jpg)not uniform, eg the distances between 0-100, 100-200, 200-300 are so different?
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Because the bag isn’t a uniform size up and down the length of it. The saline solution deforms the shape
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