Temperature Measurement Standards. ASTM's temperature measurement standards provide the material and property specifications, as well as guides for the testing, calibration, and use of laboratory, industrial, and clinical instruments used in the determination of thermal variables, particularly temperature.
A bulging disc occurs more often as we age or as repetitive activities weaken the the disc. Herniated discs are more often specifically related to trauma/injury sustained and are more acute (sudden) in onset.
Also known as a ruptured, herniated or slipped disc, a torn disc is a condition in which the outer layer of one of the intervertebral discs that cushion vertebrae in the spine develops a tear. In some cases, this rupture allows the jelly-like inner core of that disc to leak out. Symptoms of a torn disc include: