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.
auditory processing disorder apd also known as central auditory processing disorder capd is a hearing problem that affects about 5 % of school aged children kids with this condition can t process what they hear in the same way other kids do because their ears and brain don t fully coordinate something interferes with the way the brain recognizes and interprets sounds especially speech with the right therapy kids with apd can be successful in school and life