Gas Laws
“This principle explains why objects feel an upward force when immersed in a fluid.”
What is Archimedes’ Principle?
This term describes the deepest depth recorded on a diver’s depth gauge during a dive.”
What is Deepest Depth?
This is a specified depth where a diver must remain for a certain amount of time during ascent.”
What is a Decompression Stop?
“This abbreviation is logged at the moment a diver first begins the descent portion of the dive.”
What is LS?
“According to this decompression mode selection flowchart, if in-water decompression on air is 15 minutes or less, this decompression method is used.”
What is In-Water Decompression on Air?
“On the Navy No-Decompression Limits and Repetitive Group Designation Table, this is the deepest depth that allows unlimited bottom time without exceeding no-decompression limits.”
What is 20 feet?
“This law states pressure and volume are inversely related at constant temperature.”
What is Boyle’s Law?
“This is the total elapsed time from when the diver leaves the surface until reaching the bottom.”
What is Descent Time?
“This is a structured set of decompression schedules or limits arranged by depth and bottom time.”
What is a Decompression Table?
“This abbreviation marks the point when the diver arrives at planned working depth.”
What is RB?
“According to the flowchart, if ORCA is not available but a chamber is available, this decompression method is selected.”
What is Surface Decompression on Oxygen?
“This unit of pressure measurement, commonly abbreviated in Navy diving tables, represents the pressure exerted by seawater depth and is used to describe a diver’s depth underwater.”
What is Feet of Sea Water?
This law says the volume of a gas increases as temperature rises, if pressure stays constant.”
What is Charles’ Law?
“This is the total elapsed time from when the diver leaves the surface until leaving the bottom.”
What is Bottom Time?
“This is a specific decompression procedure for a certain depth and bottom time combination, usually written in feet and minutes.”
What is a Decompression Schedule?
“This abbreviation is recorded when the diver departs the bottom to begin ascent or decompression.”
What is LB?
“This abbreviation in the flowchart refers to having an oxygen-regulated console available, allowing the diver to receive 100% oxygen in the water.”
What is ORCA?
“This is the order in which decompression schedules are written in Navy diving tables.”
What is feet followed by time in minutes?
“This law tells us that total pressure is the sum of all partial pressures of gases in a mixture.”
What is Dalton’s Law?
“This term describes the total elapsed time from when the diver leaves the bottom until arriving back at the surface.”
What is Total Decompression Time?
“This is the pneumofathometer reading taken while divers are on the stage just before leaving the bottom.”
What is Stage Depth?
“This single-letter abbreviation indicates arrival at a required decompression stop during ascent.”
What is R?
“According to the flowchart, if a chamber is not available, this limitation is placed on in-water decompression on Air or Air/O₂.”
What is TDT NTE 90 minutes?
"According to the decompression schedule 70'/60, this is the amount of time the diver spends at 20 feet while breathing oxygen.”
What is 8 minutes?
“This law notes that the amount of gas dissolved in a liquid is proportional to the gas’s partial pressure"
What is Henry’s Law?
“This is the total elapsed time from when the diver leaves the surface until returning back to the surface.”
What is Total Time of Dive?
“This is the deepest depth obtained by the diver after correcting depth gauge readings for error and is the depth used to enter decompression tables"
What is Maximum Depth?
“This single-letter abbreviation indicates departure from a decompression stop after completing the required stop time.”
What is L?
“According to the flowchart, if in-water Air/O₂ total decompression time exceeds 90 minutes and a chamber is available, this decompression method is used.”
What is Surface Decompression on Oxygen (SurDO2)?
DAILY DOUBLE 💥
“This Repeat Group Designator is obtained when a diver has a pneumofathometer reading of 70 feet and a bottom time of 25 minutes.”
What is H?
Remember to add 5 feet to the depth and 5 minutes to the time, then move to the next available Navy table schedule, placing the dive on an 80'/32 schedule.