Volume is mass. Volume of liquids means the amount of liquid that takes up in a container. You find volume of liquid using a graduate cylinder. The basic unit of measurement for volume of liquid is liters. If there is a small amount, the unit is milliliters. When you read the amount of liquid in the graduate cylinder you read the bottom of the meniscus. A meniscus is the lowest convex dip of the volume of liquid in the graduate cylinder. Make sure you figure out all of the calibration marks on the graduated cylinder, because they are not all marked the same.
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