Tin, lead and their alloys, due to their low melting temperatures and wide availability, are the most commonly used solder materials. In fact, lead has been used as a soldering metal for water pipes (also made of lead) even in Roman times, hence the scientific name for lead, Plumbum. Mechanical Properties.
hearing impairment - impairment of the sense of hearing. hearing disorder. disability, disablement, handicap, impairment - the condition of being unable to perform as a consequence of physical or mental unfitness; reading disability; hearing impairment. deafness, hearing loss - partial or complete loss of hearing.
sensory deprivation a condition in which an individual receives less than normal sensory input. It can be caused by physiological, motor, or environmental disruptions. Effects include boredom, irritability, difficulty in concentrating, confusion, and inaccurate perception of sensory stimuli. Auditory and visual hallucinations and disorientation in time and place indicate perceptual distortions due to sensory deprivation.