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Fathom
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A linear unit of measurement (equal to 6 feet) for water depth - commonly used by fishermen. Depth = V x T/2
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ffw
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feet of fresh water. Measurement of depth in fresh water.
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First Stage
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Regulator attached to the scuba tank that lowers the tank pressure to ambient pressure plus a pre-determined pressure (e.g., ambient + 140 psi).
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Foramen Oval
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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.
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Forward Roll Entry
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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.
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Free Diving
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Diving without any scuba or other equipment and synonymous with breath-hold diving.
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fsw
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feet of sea water. Measurement of depth in sea water.
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FSW
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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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