Final answer:
A respirator with pressure inside of it that is higher than the ambient air pressure is a Positive-pressure respirator, ensuring air will flow out if there's a leak, and providing a higher level of protection against contaminants.
Step-by-step explanation:
A respirator where the pressure inside the respiratory inlet covering exceeds the ambient air pressure outside the respirator is known as a Positive-pressure respirator.
This type of respirator creates a pressure that is greater than the atmospheric pressure, ensuring that if there is any leak in the respirator system, air will flow outwards rather than contaminants flowing in.
This contrasts with a Negative-pressure respirator, which operates by forming a negative pressure inside the respiratory inlet as the user inhales, drawing air through a filter.
In the context of respiration, Pulmonary ventilation involves the movement of air in and out of the lungs, which is driven by differences in atmospheric and intra-alveolar pressures.
Positive-pressure respirators are especially important in environments with a high risk of contamination, as they provide a higher level of protection.