What pressure keeps lungs inflated?

Pressure within the lungs. Causes the lungs the lungs to remain slightly inflated after expiration. Pressure within the alveoli of the lungs.

Intrathoracic pressure

The pleural fluid prevents friction between the lungs and the ribs when breathing. it also keeps the lungs inflated

The most common type of pressure in stars is the thermal pressure. It is similar to the pressure that keeps a balloon inflated.

1) Surfactant keeps it from collapsing completely, but 2) Air pressure inflates it beyond the minimum (the lower pressure around it is developed by the chest wall & the diaphragm.)

Transpulmonary pressure

The type of air that keeps a beach ball inflated is kinetic energy.

Hyper means over normal. Inflated means blown up. The lungs are over-inflated.

the fetal pig cannot have air in its lungs

The texture of the lungs in a fetal pig are of a solid nature. This is because the lungs have not been inflated.

When a tire is properly inflated it will be level to the ground. Over inflated and the middle of the tire has the most pressure on the ground. Under inflated and the sides of the tire have the most pressure on the ground.

Our lungs are surrounded by bones and it keeps the lungs in place.

The pig has not yet used the lungs to breathe, so therefore they lungs have not been inflated and filled with air.

This prevents the air you are trying to get into them from leaving through the nose, and helps keep enough pressure going into the lungs to get them inflated.

you can try to tell by gripping it, if it is firm then it is fully inflated. if it is kind of squishy, then it is under inflated. With a pressure gauge.

... is greater then the pressure in the surrounding atmosphere.

If you mean a hot air balloon, it is the expansion of the air caused by the propane burner. If you mean any balloon, it is the ability of the material to hold the air or gas inside which keeps it inflated.

Normally, the pressure in the lungs is greater than the pressure in the pleural space surrounding the lungs

Gas particles travel from an area of higher pressure to lower pressure when air leaks out of an inflated ball.

when air moves out of the lungs, the air pressure decreases

Air doesn't really move in and out at all while the lungs stay full. As the diaphragm pushes upwards, the lungs are mostly emptied and air is expelled; the diaphragm then moves down and fills them again. If the lungs remain inflated, then the diaphragm isn't moving and air exchange doesn't happen.

Intrapleural pressure is the pressure difference between the lungs and the pleural cavity of the lungs.

The epiglottis keeps food from entering the lungs. The epiglottis is a flap of tissue that is located at the entrance of the larynx.

The potential space between the lining of the chest cavity (pleura) and the lining that covers the lungs (also called the pleura). These linings are made of serous membranes that secrete serous fluid for lubrication, so there is no friction during breathing when the lungs expand and contract against the chest wall. There is a vacuum maintained in this space that keeps the lungs inflated.

When we inhale, the diaphragm increases the volume of space in the chest, and this leaves the air pressure in the lungs lower than that of the atmosphere. As the atmospheric pressure is then greater than the pressure of air in the lungs, the pressure of the atmosphere (or atmospheric pressure) will force air into the lungs.