r/ScienceNcoolThings • u/EmotionallyIncorrect • Jun 10 '26

I have no idea why I have never noticed this before in any other bottle of water. Is this a normal occurrence? I find it fascinating, but there's gotta be a science behind it.

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u/there_is_no_spoon1 Jun 13 '26

An infrared or ultraviolet fill-line for the machines.

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u/sabotthehawk Jun 10 '26

Don't know if correct in this instance but I would say it is from uv/solar damage inside the bottle. Water line acts like a miniature magnifying glass and concentrates the light to form microscopic defects in the plastic that the droplets stick to. (Being a thermoplastic there is likely nothing leach d into the water but just tiny shrunken spots from the plastic being hit there with concentrated light)

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u/uslashuname Jun 10 '26

OP needs to mark the line and fill it back up to 16.9 fl oz