- Fathom
- A linear unit of measurement (equal to 6 feet) for water depth - commonly used by fishermen. Depth = V x T/2
- ffw
- feet of fresh water. Measurement of depth in fresh water.
- First Stage
- Regulator attached to the scuba tank that lowers the tank pressure to ambient pressure plus a pre-determined pressure (e.g., ambient + 140 psi).
- Foramen Oval
- The opening between the left and right atria of the fetal heart which remains open in about 30% of people, allowing passage of bubbles into the arterial circulation which is believed to cause symptoms of arterial gas embolism.
- Forward Roll Entry
- A method of entering the water while in full SCUBA gear from a boat transom or a pier by bending at the knees and, while firmly securing the mask, rolling forward into the water landing on one's shoulders and tank.
- Free Diving
- Diving without any scuba or other equipment and synonymous with breath-hold diving.
- Frenzel maneuver
- Technique for equalizing the middle ear by pinching the nose closed and moving the back of the tongue upwards.
- Frog kick
- Finning technique where thrust is developed by sweeping the fins horizontally toward each other with the fins twisted into a nearly vertical plane, with the soles facing each other, followed by a recovery stroke which develops negligible thrust where the fin blades are feathered. The legs are fairly straight during the power stroke. See also modified frog kick.
- Frogman
- A scuba diver, particularly a military diver on an undercover mission.
- fsw
- feet of sea water. Measurement of depth in sea water.
- FSW
- Feet of sea water; used to indicate either an actual depth, or just a pressure equal to that depth (e.g., in an hyperbaric chamber).
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There are 12 scuba glossary terms listed. |
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