What type of measurement will you use to calculate how big the surface of a football fied is (not how long)

square feet would be the best measurement of the surface

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.