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.
spirometer
It decreases Residual Volume
spirometer
I don't know. That's what I am looking for.
All volumes are measured in litres.
It most often is, depending on the fluid and the volume administered. Larger volumes are measured in litres.
Functional residual capacity (FRC)
In the metric system look for milliliters. In the SAE look for fluid ounces.
Pulmonary function tests are used to diagnose respiratory disorder. Lung volume and lung capacities are measured. Normally the doctor will use an instrument called spirometer to measure various lung volumes. Some of the lung disorder a patient can have are: asthma, and Emphysema.