PFT spirometry is the simplest test of all. This PFT test process evaluates the lungs' capacity to keep air as well as their capacity to expel air with power. PFTs also contain lung capacity tests that aid in determining lung volume, airflow, and gas exch...

Barite is a type of mineral containing potassium sulfate or potassium borate. Barite is most commonly yellow or white in color, and the most common source of this mineral is barium sulfate. It is often found as a deposit in the rocks of North America, par...