Respiratory volume is defined as how much air a person can hold in their lungs. Respiratory volume can be measured by having the person take a deep breath, and blow out into a device that measures air capacity.
Small volumes can be measured.
One example is the spirometer.
It decreases Residual Volume
spirometer
spirometer
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All volumes are measured in litres.
It most often is, depending on the fluid and the volume administered. Larger volumes are measured in litres.
In the metric system look for milliliters. In the SAE look for fluid ounces.
Functional residual capacity (FRC)
In the laboratory, volumes of liquid are usually measured with a graduated cylinder. This piece of equipment has markings along the side that allow for precise measurement of the volume of liquid it contains.