Answer:
PAIN:
Nociceptive Pain: Typically the result of tissue injury.
Inflammatory Pain: An abnormal inflammation caused by an inappropriate response by the body's immune system.
Neuropathic Pain: Pain caused by nerve irritation.
Functional Pain: Pain without obvious origin, but can cause pain.
PRESSURE:
Absolute pressure: The clearest reference pressure is the pressure zero, which exists in the air-free space of the universe.
Atmospheric pressure.
Differential pressure.
Overpressure (gauge pressure).
