Because liquid can't retain its shape. It needs to be in a container to have a definite form.
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Using a container to measure the volume of a liquid provides an accurate measurement. Containers are designed with calibrated markings that allow for precise readings. Additionally, containers help prevent spillage and ensure that the liquid is contained and measured correctly.
You would use liters (L) to measure the volume of a soda container in the metric system.
You can use some type of calibrated container: a graduated cylinder or beaker, generally. Another method would be to measure the mass of the liquid (any container will do, after you have tared the container) and divide by the density of the liquid (if you know it). These work for any liquid as long as it doesn't evaporate quickly. Also, the volume of a liquid may depend on temperature, so the volume at zero Celsius will be different from the volume at 98 Celsius, for example.
To find the density of a liquid, you would need to measure the mass of a known volume of the liquid. Once you have these measurements, you can calculate density by dividing the mass by the volume. The formula for density is Density = Mass/Volume.
The density of a small solid sample can be determined by using the displacement method. This involves submerging the sample in a known volume of liquid (such as water) and measuring the volume of liquid displaced. The density is then calculated by dividing the mass of the sample by the volume of liquid displaced.
To measure the amount of liquid in a container, you can use measuring cups, graduated cylinders, or a kitchen scale. Simply pour the liquid into the measuring tool and read the volume or weight markings to determine the amount.