meniscus
This line is called the meniscus.
The fill line of a graduated cylinder is known as the meniscus. It is the curved surface of a liquid in the cylinder caused by the surface tension between the liquid and the glass. Scientists must take measurements at the bottom of the meniscus for accuracy.
The slight dip in a graduated cylinder is called a meniscus.
The "bottom of a curved line" made by the liquid in a graduated cylinder could be called the "measuring line" or "reference line" in the application of that piece of labratory equipment. The curved surface of the liquid itself is called the meniscus, and we look to the bottom of the meniscus to make our reading as to the volume of the liquid in the graduated cylinder. The liquid in the cylinder "grabs" the sides of the cylinder and "pulls itself up" just a bit, and that creates the curve in the surface of the liquid. And that curve, the meniscus (which is from the Greek word for crescent), leaves us with a problem: where do we "read" the volume marked off by the graduations along the side of the cylinder? And the answer is, "At the bottom of the meniscus."
A graduated cylinder is called such because it is more than just a cylinder. It is a cylinder used to measure liquid volume precisely. It is technically "smarter" than a cylinder hence it is "graduated".
calibration mark
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calibration mark
Liters
A graduated cylinder is used to measure liquid volume in milliliters, mL. When you place a liquid into a glass graduated cylinder, you will see that the "line" at the top of the column of liquid is actually curved downward. This is called the meniscus. When you measure the liquid volume, you record the volume in mL at the bottom of the meniscus.
The meniscus.
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