Is pressure highest in the lung when lungs are full after inspiration or empty exhalation?

Pressure is highest in the lungs when they are full after inspiration.

When you breathe in, your diaphragm contracts and your lungs expand. This creates a negative pressure in the lungs, which draws air in. As your lungs fill with air, the pressure inside them increases. When your lungs are full, the pressure inside them is higher than the pressure outside them. This is why you can blow air out of your lungs.

When you breathe out, your diaphragm relaxes and your lungs collapse. This creates a positive pressure in the lungs, which pushes air out. As your lungs empty, the pressure inside them decreases. When your lungs are empty, the pressure inside them is lower than the pressure outside them. This is why you have to breathe in again.

The pressure in the lungs is constantly changing during the respiratory cycle. It is highest when the lungs are full after inspiration and lowest when the lungs are empty after exhalation.