Divers (and others) call the compressed air cylinders used by divers tank(s) or Scuba tank(s).
Free diving is diving without scuba. Skin diving means diving without a wetsuit or scuba. Since you can free dive without a wetsuit they can be the same thing but they are not necessarily always the same thing.
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John L. Cramer has written: 'Skin and scuba diving' -- subject(s): Skin diving
Kurt Svrcula has written: 'Diving in Malaysia' -- subject(s): Deep diving, Guidebooks, Scuba diving, Skin diving
George F. Brookes has written: 'Underwater swimming' -- subject(s): Scuba diving, Skin diving 'Sub aqua' -- subject(s): Skin diving
Steve Rosenberg has written: 'Diving & snorkeling, Monterey Peninsula & Northern California' -- subject(s): Guidebooks, Scuba diving, Skin diving 'Diving and snorkeling guide to northern California and the Monterey Peninsula' -- subject(s): Guidebooks, Scuba diving, Skin diving 'Lonely Planet Diving & Snorkeling Turks & Caicos (Lonely Planet Diving and Snorkeling Turks and Caicos)' 'Diving Cozumel' -- subject(s): Guidebooks, Scuba diving
Kurt Amsler has written: 'The Caribbean dive guide' -- subject(s): Guidebooks, Deep diving, Scuba diving, Skin diving 'Diving Guide to the Caribbean (Diving Guides)'
John Ratterree has written: 'Diving and snorkeling guide to the Red Sea' -- subject(s): Guidebooks, Deep diving, Skin diving
Christopher Wayne Dueker has written: 'Scuba diving in safety and health' -- subject(s): Diving, Physiological aspects, Physiological aspects of Scuba diving, Safety measures, Scuba diving, Skin diving
Gill covers?
Judy Gail May has written: 'Great Diving' -- subject(s): Directories, Skin diving
Skin diving is any underwater activity done without the use of SCUBA gear, using a mask and flippers, and possibly a snorkel.It includes swimming, spear fishing, free dive photography, competitive breath-hold free diving and other apnea competitions.