the Niskin bottle

A Niskin bottle is a scientific tool used to collect water samples from specific depths in lakes, rivers, or oceans. It consists of a cylindrical container with a hinged bottom and a closing mechanism at the top. When lowered into the water, scientists set it to the desired depth, and then activate a trigger that seals the bottle, trapping water from that precise layer. This allows researchers to analyze water chemistry, temperature, or organisms accurately from specific depths, helping us understand aquatic environments and their conditions without mixing different layers.