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.
The definition of the Committee of UK Medical Professionals Steering the UK Auditory Processing Disorder Research Program is as follows: APD results from impaired neural function and is characterised by poor recognition, discrimination, separation, grouping, localisation, or ordering of speech sounds. It does not solely result from a deficit in general attention, language or other cognitive processes..