Earmuffs
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(Redirected from Ear defender)
Earmuffs are objects designed to cover a person's ears for protection. They consist of a thermoplastic or metal head-band, that fits over the top of the head, and a pad at each end, to cover the external ears. They come in two basic kinds:
- Thermal earmuffs, worn in cold environments to keep a person's ears warm.
- Acoustic earmuffs, also known as ear defenders: cups lined with sound-deadening material, like thermal earmuffs and headphones in appearance, which are worn as hearing protection. These may be carried on a head-band or clipped onto the sides of a hard hat, for use on construction sites. Some manufacturers combine headphones with ear defenders, allowing the wearer to listen to a music, communication or other audio source and also enjoy protection or isolation from ambient noise.
Ear defenders protect the wearer from extreme noises.They are like earmuffs or headphones in appearance.The head band and outer covering is usually made from a hard thermoplastic or metal. The protection usually comes from acoustic foam - this absorbs sound waves byincreasing air resistance,thus reducing the amplitude of the waves. The energy is transformed into heat.
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