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  • 8,000 feet
  • Descents are part of normal procedures, but also occur during emergencies, such as rapid or explosive decompression, forcing an emergency descent to below 10,000 feet (3,000 m) and preferably below 8,000 feet (2,400 m), respectively the maximum temporary safe altitude for an unpressurized aircraft and the maximum safe altitude for extended duration. (wikipedia.org)
  • See Loss of pressurization: The maximum sustained cabin pressure altitude is 8,000 feet (2,400 m). (wikipedia.org)
  • 1500
  • During our approach to basecamp at "Plaza de Mulas", we gradually ascend 1500 metres/5000 feet, over 3 days. (summitclimb.com)
  • The trail then descends approximately 1000 metres including an irregular staircase of approximately 1500 steps, some of which were carved into solid granite. (wikipedia.org)
  • diver
  • the reduction of ambient pressure on underwater divers after hyperbaric exposure and the elimination of dissolved gases from the diver's tissues The decompression of a diver is the reduction in ambient pressure experienced during ascent from depth. (wikipedia.org)
  • Decompression in the context of diving derives from the reduction in ambient pressure experienced by the diver during the ascent at the end of a dive or hyperbaric exposure and refers to both the reduction in pressure and the process of allowing dissolved inert gases to be eliminated from the tissues during this reduction in pressure. (wikipedia.org)
  • ascent Part of the dive profile where the diver is moving upwards towards the surface. (wikipedia.org)
  • An ascent may be interrupted by stops (q.v.), when the diver maintains a functionally constant depth for the purpose of decompression, and pulls (q.v.), during which periods there is consistently upwards movement (minor variations in the scale of a few seconds are generally ignored). (wikipedia.org)
  • exposures
  • The descent, bottom time and ascent are sectors common to all dives and hyperbaric exposures. (wikipedia.org)
  • Fortunately he was using a photographic telescope, and was able to obtain some 500 exposures, as results from more traditional visual methods (meridian line or micrometre measurements) would have been far less conclusive. (wikipedia.org)
  • bubbles
  • arterial bubble model Decompression model in which the filtering capacity of the lung is assumed to have a threshold radius of the size of a red blood cell and sufficiently small decompression bubbles can pass to the arterial side, especially during the initial phase of ascent. (wikipedia.org)
  • occupants
  • The primary means to ensure occupant survivability rests in quickly bringing the occupants to a cabin pressure where they can survive (i.e., a lower cabin pressure altitude as given in the table below). (wikipedia.org)
  • bends
  • Joint pain ("the bends") accounts for about 60% to 70% of all altitude DCS cases, with the shoulder being the most common site. (wikipedia.org)
  • aircraft
  • The aircraft would then dive at a 60-90° angle, holding a constant speed of 500 to 600 kilometres per hour (310 to 370 mph), until it had gone some 90% of the way to the ground, releasing its bombs at a minimum height of 450 metres (1,480 ft). (wikipedia.org)
  • DCS most commonly refers to problems arising from underwater diving decompression (i.e., during ascent), but may be experienced in other depressurisation events such as emerging from a caisson, flying in an unpressurised aircraft at altitude, and extravehicular activity from spacecraft. (wikipedia.org)
  • ambient pressure
  • During ascent, the ambient pressure is reduced, and at some stage the inert gases dissolved in any given tissue will be at a higher concentration than the equilibrium state and start to diffuse out again. (wikipedia.org)
  • peak
  • The Chinese mountaineering team of Wang Fuzhou, Gonpo, and Qu Yinhua made the first reported ascent of the peak from the north ridge on 25 May 1960. (wikipedia.org)
  • In 1997, a re-survey using satellite technology established its summit (known as Low's Peak) height at 4,095 metres (13,435 ft) above sea level, which is some 6 metres (20 ft) less than the previously thought and hitherto published figure of 4,101 metres (13,455 ft). (wikipedia.org)
  • known
  • What is commonly known as no-decompression diving, or more accurately no-stop decompression, relies on limiting ascent rate for avoidance of excessive bubble formation. (wikipedia.org)
  • rate
  • A staged decompression is interrupted by decompression stops at calculated depth intervals, but the entire ascent is actually part of the decompression and the ascent rate is critical to harmless elimination of inert gas. (wikipedia.org)
  • A no-decompression dive, or more accurately, a dive with no-stop decompression, relies on limiting the ascent rate for avoidance of excessive bubble formation. (wikipedia.org)
  • Intentional descents might be undertaken to land, avoid other air traffic or poor flight conditions (turbulence, icing conditions, or bad weather), clouds (particularly under visual flight rules), to see something lower, to enter warmer air (see adiabatic lapse rate), or to take advantage of wind direction of a different altitude, particularly with balloons. (wikipedia.org)
  • For example, tables using Bühlmann's algorithm define bottom time as the elapsed time between leaving the surface and the start of the final ascent at 10 metres per minute, and if the ascent rate is slower, then the whole of the ascent time needs to be considered part of the bottom time for the algorithm to remain safe. (wikipedia.org)
  • usually
  • Nevertheless, all currently popular decompression procedures advise a 'safety stop' additional to any stops required by the algorithm, usually of about three to five minutes at 3 to 6 metres (10 to 20 ft), even on an otherwise continuous no-stop ascent. (wikipedia.org)
  • include
  • Staged decompression may include deep stops depending on the theoretical model used for calculating the ascent schedule. (wikipedia.org)
  • Everest
  • Nepal has the elevation of 8848 meters, which is Mt. Everest, and regions which has elevation of 60 meters squeezed into 500 kilometers making it culturally, geographically and naturally diverse. (wikitravel.org)
  • travellers
  • It has been described as affecting from 25% to up to 85% of travellers to high altitude, depending on location and rate of ascent. (patient.info)
  • In the case of underwater diving and compressed air work, this mostly involves ambient pressures greater than the local surface pressure, but astronauts, high altitude mountaineers, and travellers in aircraft which are not pressurised to sea level pressure, are generally exposed to ambient pressures less than standard sea level atmospheric pressure. (wikipedia.org)
  • oxygen
  • The lack of oxygen at high altitude triggers a series of physiological response that affects the organs of the body including the lungs, heart, brain and the kidneys. (ezyhealth.com)
  • This is complicated at depths beyond about 150 metres (500 ft), because a helium-oxygen mixture (heliox) then causes high pressure nervous syndrome. (wikipedia.org)
  • meters
  • Kalinchowk is located northeast direction from Katmandu lie at an altitude of 3579 meters one can get excellent view of Annapurna, Lamjung, Manaslu, Ganesh Himal, Shishapanga, Langtang, Dorjee Lakpa, Jugal Himal and Gauri Shanker. (nepaltrekkingpass.com)
  • elevation
  • Manali - Rohtang Jot - Gramphu - Kokhsar - Tandi - Keylong - Jispa - Darcha - Zingzingbar - Baralacha La - Bharatpur - Sarchu (state border) - Gata Loops - Nakee La - Lachulung La - Pang - More Plains - Tanglang La - Gya - Upshi - Karu - Leh 1: Manali (altitude 1,950 m (6,400 ft)) to Marhi at 3,300 m (10,800 ft) elevation 33 km (21 mi). (wikipedia.org)
  • maximum
  • A maximum of 500 people are allowed on the trail each day, of which only 200 are trekkers, the rest being guides and porters. (wikipedia.org)
  • below
  • The primary means to ensure occupant survivability rests in quickly bringing the occupants to a cabin pressure where they can survive (i.e., a lower cabin pressure altitude as given in the table below). (wikipedia.org)