Any puddle of water can start the process sunlight initiates the process and photosynthesis soon creates a green layer within the puddle.

Traditional Florence flasks typically do not have a ground glass joint on their rather longer necks, but typically have a slight lip or flange around the tip of the neck.

And that prompted people to make maps like this, with all kinds of wonderful detail on the land, but when you get to the waters edge, the ocean looks like one giant puddle of blue paint.

If the L V ratio gets too high, the wheel flange will be pressing against the rail face, and during a turn this will cause the wheel to climb the face of the rail, potentially derailing the railcar.

Then I found out, post exposure, that this plastic bag if I put it into a filthy puddle or a stream filled with coliforms and all sorts of disgusting stuff, that that filthy water will migrate through the wall of the bag by osmosis and end up inside it as pure, potable drinking water.