source: subsurface/terms

Last change on this file was 0b5f33f3, checked in by Dirk Hohndel <dirk@…>, 3 months ago

PO₂ > pO₂

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1Do not translate this file.
2This just tries to collect some of the terms you will run into
3when translating Subsurface
4
5SAC              Surface equivalent air consumption
6                 The air consumed during a dive at different
7                 depth is adjusted for depth/pressure to give
8                 an easy to understand air consumption number
9
10OTU              Oxygen Toxicity Unit - a measurement how O₂
11                 negatively impacts the lung tissue. This number
12                 has no unit, the values are rather abstract
13
14CNS              Central Nervous System Oxygen Toxicity - a
15                 measurement how O₂ negatively impacts the
16                 central nervous system - this is a percentage
17                 or a number <= 1
18
19maxCNS           the highest CNS value during a dive
20
21pO₂, pN₂, pHe    These are all partial pressures of the three
22                 gases Oxygen (O₂), Nitrogen (N₂) and Helium (He).
23
24O₂%, He%         The fraction of Oxygen and Helium in a gas.
25                 The partial pressure is therefore the pressure
26                 of the gas times the fraction of the specific
27                 component. E.g. a gas with O₂% = 30 (also called
28                 30% Nitrox or EAN30) at 30m depth (where the
29                 pressure is 4atm) therefore has a pO₂ of
30                 4 * 0.30 = 1.2
31
32Trimix           Gas Mixture containing Helium, Oxygen and Nitrogen.
33
34Heliox           Gas Mixture containing Helium and Oxygen.
35
36Nitrox           Gas Mixture containing Nitrogen and Oxygen.
37
38TC               Tissue Compartment, is a logical tissue interface to various
39                 tissues in the human body. Since each tissue has its own gas
40                 dissolving time, they have been categorized into compartments.
41
42CSV              Comma separated values - a common file format
43
44TSV              Tab separated values - a common file format
45
46Stopdepth        The depth at which the diver needs to wait for
47                 some time in order to "off-gas". Also deco stop.
48
49WorkPress        Working Pressure of a tank - the pressure it should
50                 be filled to
51
52StartPress       Starting Pressure - at the beginning of a dive
53
54EndPress         Ending Pressure - at the end of a dive
55
56Deco MOD         The Maximum Operating Depth for a decompression gas,
57                 which is the depth at which the diver wants to switch
58                 to a decompression gas
59
60Bot. MOD         The Maximum Operating Depth for a gas used in the bottom
61                 phase of a dive
62
63Device ID        Unique ID for a specific dive computer
64
65trip             dives are grouped into "trips" based on their
66                 individual start time. As soon as there are more than
67                 48h between dives the automated algorithm will start
68                 a new trip
69
70UDDF             standardized file format
71
72GFHigh, GFLow    Gradient Factors of the Buehlman algorithm. These
73                 impact the way the deco obligations are calculated
74                 in Subsurface. Typically these are between 20 and 100.
75                 Lower is more conservative (i.e., more deco). It's
76                 possible to use values below 20 and above 100 in
77                 certain circumstances, but 70/30 is much more common.
78
79CC               Closed circuit - short for "rebreather diving"
80
81OC               Open circuit - traditional scuba
82
83CC Setpoint      Rebreathers often are run with a fixed pO₂ - the "setpoint"
84
85Bailing out to OC
86                 in a rebreather dive the dive switches to their emergency
87                 OC equipment
88
89Auto Group       automatically arrange dives into trips
90
91Ceiling          when the diver is "in deco", i.e., when the diver cannot
92                 directly ascend to the surface but has to put in "stops"
93                 to give their body time to "off gas" (reduce the amount of N₂
94                 and potentially He in the body), there is a minimum depth
95                 they should not climb above - that's the ceiling. Often a
96                 diver will do a deco stop well below the ceiling
97
98Viz              short for visibility
99
100belt, ankle      weight system types - a backplate is used mostly by tech
101backplate,       divers to mount the tanks on (recreational divers have a BC,
102integrated,      tech divers usually a backplate and a wing)
103clip-on
104
105rbt              remaining bottom time
106
107rgt              remaining gas time
108
109workload         is this a strenous dive?
110
111deepstop         stop well below the ceiling
112
113safety stop      stop at the end of a recreational dive, typically
114                 3 minutes at 5 meters
115
116below floor      event showing dive is below the depth where the dive
117                 is acruing additional deco time
118
119OLF              Oxygen Limit Fraction; Suunto specific term for CNS
120
121rgbm             reduced gradient bubble method - alternative deco
122                 algorithm
123
124non stop time    amount of time the diver can stay at the current depth
125NDL              without going into deco
126
127EAD              equivalent air depth
128
129END              effective equivalent Nitrogen depth
130
131EADD             equivalent air density depth
132
133TTS              time to surface (including deco stop and reasonable
134                 ascent speed)
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