Final answer:
To reestablish negative pressure in the lungs and prevent them from collapsing, medical professionals attach a suction bulb to a chest cavity device. This suction ensures the lungs can inflate during trauma or surgery. In related situations, like helping an unconscious person breathe, the application of precise force to a balloon is equally critical.
Step-by-step explanation:
Squeezing the air from a suction bulb and attaching it correctly is crucial when applying suction to a patient’s chest cavity. This process is typically used during medical procedures such as surgeries or for trauma victims to reestablish negative pressure in the chest cavity. The negative pressure is important because it allows for inflating the lungs properly. If air is allowed to enter the chest cavity freely, it can lead to a pneumothorax, where one or both lungs may collapse due to the loss of negative pressure normally maintained by liquid adhesion. Therefore, the suction bulb should be attached to a device that safely applies the necessary suction to the chest cavity.
To provide a practical example in a similar realm of medical care, when forcing air into an unconscious person's lungs using a balloon, one must exert an appropriate force to create the necessary gauge pressure. For instance, to achieve a gauge pressure of 4.00 cm water, and assuming an effective area of 50.0 cm², health professionals must calculate the correct force to apply.