How does the movement of the diaphragm causes the air to go to in and out?

The diaphragm is a dome-shaped muscle located at the base of the lungs. When it contracts, it flattens, increasing the volume of the thoracic cavity and creating a negative pressure that draws air into the lungs. Conversely, when the diaphragm relaxes, it returns to its dome shape, decreasing the thoracic cavity volume and pushing air out of the lungs. This contraction and relaxation cycle facilitates the process of inhalation and exhalation.