A meniscus, but whether it has a positive curve or a negative one depends on whether it wets the glass.
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A meniscus.
The upper surface of the liquid in a graduated cylinder is called the meniscus. It appears curved due to surface tension, and the measurement should be read at the bottom of the meniscus for an accurate volume reading.
The bubble is called a meniscus. It is caused by surface tension, and usually appears as a curved surface at the top of the liquid in the test tube. To accurately measure the volume of liquid, the measurement should be taken at the bottom of the meniscus.
It is called a MENISCUS caused by capillary action betweem the molecules of the liquid and the molecules of the container, and resulting from surface tension within the liquid. In addition: Adhesion: Making one material adhere to another.