The Human lungs have an extensive surface area for gas exchange which have a surface area between 50 to 75 square meters (540 to 810 square feet) when opened them wide. which can roughly comparable to the size of a tennis court. Could anyone would have ever imagined our lungs which are fitted inside the rib cage which performs the most important phenomenon by which we are alive would be this BIG.

Lungs are designed to maximize surface area for efficient gas exchange. This extensive area of lungs are achieved through the intricate structure of alveoli, tiny air sacs where oxygen and carbon dioxide are exchanged. This highlights the human lungs' capacity to handle large volumes of air and facilitate respiration.
Imaging Technique: Techniques such as CT scans and MRI can be used to assess lung structure and estimate their surface area.
Some Mathematical Models: Researchers often use mathematical models to estimate the surface area based on lung volume and other anatomical measurements.
Extensive surface area in lungs is very essential for efficient gas exchange, which is crucial for sustaining a healthy & happy life.