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Explanation The liquid in a graduated cylinder curves up at the edge where the liquid meets the wall of the cylinder. This curve in the liquid is called the meniscus and is used to determine the volume of liquid in a graduated cylinder by observing the measurement tick closest to the bottom of the meniscus.:
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He's reading to try to distract himself from the grief of losing a "rare and radiant maiden" named Lenore. ... Perhaps the gentle knocking on the door causes him to hope that it's Lenore, and he has to tell himself otherwise in order to quell the likely disappointment that reality will bring him.