FACTOID # 12: It's not the government they hate: Washington DC has the highest number of hate crimes per capita in the US.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Fullface mask
Enlarge
A diver in a pool wearing an AGA full face mask
Enlarge
A diver wearing an Ocean Reef full face mask

A full-face diving mask is a type of diving mask worn by SCUBA divers so that they can talk with the surface or other divers.


The diver can speak and hear inside the mask. This allows communications equipment to be installed in the mask and is very useful for working divers.


Some fullface masks have a mouthpiece inside: with those, if the mask floods, the diver can breathe again before clearing the mask; but the mouthpiece is strapped in like a gag, making his speech very distorted.


Without a mouthpiece inside the mask, the diver can talk fairly clearly, but if the mask floods, he cannot breathe until the mask is cleared. There also is the problem of "dead space" inside the mask causing risk of carbon dioxide buildup.


There also is the problem of the inside of the mask window misting. Some Russian gasmasks are designed so that when the wearer breathes in, the inflow of air blows over the inside of the mask window and tends to evaporate any mist deposit on it.


Many industrial breathing sets and most gasmasks for use on land have full-face masks.


See this link and this link for examples.


  Results from FactBites:
 
padi full-face mask divers specialty course pattaya thailand (829 words)
This mask is the same item of equipment used by the military / fire / police / search and rescue teams world wide, and features built in 2 way single sideband radio communication gear operated by a simple ‘push to talk’ button located on the front of the mouthpiece.
The mask is available with 2 types of regulator, an ordinary demand regulator, or a 'positive pressure' regulator, which keep a positive pressure inside the mask, this add an extra safety feature while diving in contaminated or dirty water.
The mask communications equipment is required in many countries today to be used by professional divers and recreational alike.
Science Fair Projects - Mask (728 words)
Masks are also a defining characteristic of the Noh theatre of Japan.
In many jurisidictions, it is an additional criminal offense to wear a mask while committing a crime; it is also often a crime to wear a mask at public assemblies and demonstrations.
A "life mask" is a plaster cast of a face, used as a model for making a painting or sculpture.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m