We recommend that you DO NOT use it: 1  As a link in your thermodynamics textbook. 2  As a tool in your class/homework/testing. 3  As a resource called by other software for property data.  Or in any critical application as the calculator could disappear at any time.
Back injuries are the most common job-related health problem among health care workers and include: 1  low back pain, 2  herniated discs, a condition in which the discs in the spinal column bulge out, placing pressure on the nerves in the back, 3  strained muscles,  pulled and/or torn ligaments, and.
Introduction. Injuries to the back are one of the most prevalent and costly work-related musculoskeletal disorders in the United States. Low-back pain adversely affects 1,000,000 workers in the United States every year and is responsible for more lost work days than any other musculoskeletal disorder.