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 New scuba dive mask+snorkel set(M)-snorkeling gear US $33.99 
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 New scuba dive mask+dry snorkel set(M)-snorkeling gear US $41.99
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 New scuba dive mask+snorkel+fins set-scuba diving gear US $69.90
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 VIntage dive mask US $5.00
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 Body Glove snorkel with scuba mask adult size with adjustable strap US $12.99
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 US DIVERS CO SNORKEL & PRO PROFESIONAL GRADE DACOR TEMPORED GLASS SCUBA MASK US $19.95
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 SCUBAPRO Scuba Dive Diving Snorkel Neoprene Mask Strap Black + Blue Color US $12.49
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 Full Face Scuba Mask US $2,500.00
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 SCUBAPRO Scuba Diving Dive Snorkel Neoprene Mask Strap (Black/Blue) US $12.49
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 SEAQUEST VISAGE SCUBA MASK SEA QUEST US $24.00
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 MAKO EVO SCUBA MASK W/ HARD CASE USED ONLY ONCE US $28.00
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 Speedo Dive EXPLORER Mask and Snorkel Set - Snorkeling RED BRAND NEW US $35.00
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 AMICO DIVE MASK USED IN THE BIX ! US $8.99
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 Free diving mask US $45.00
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 DIVING MASK, CLEAR-NEW US $34.00
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 TILOS TITANICA YELLOW SCUBA DIVE MASK NEW! SNORKEL! BID NOW! US $18.38
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 Pro Blue vision plus dive mask US $49.12
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 Body Glove Snorkel Set with Case Fins Mask L / XL 1-4 Dive Surf US $14.85
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 Montego Snorkel Scuba mask. Vintage Tempered Glass kids? US $7.00
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 SEADIVE SEARANGER CLEAR TEMPERED DIVE MASK US $12.00
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 New Scuba, Snorkeling, Free Diving Mask Clear US $12.90
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 New Scuba, Snorkeling, Free Diving Mask Blue/Black (M144s) US $12.90
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 New Scuba, Snorkeling, Free Diving Mask Blue US $12.90
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 New Scuba, Snorkeling, Free Diving Mask Blue/Black (M5262) US $12.90
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A scuba diver dives to a depth of 20m in ocean water. If the circular glass plate in the diver's face mask ?
A scuba diver dives to a depth of 20m in ocean water. If the circular glass plate in the diver's face mask has a diameter of 16cm, what force does the water exert on it?
Force his face is:
G = m*g
m=density_of_water*V
V=h*S
S=pi*(d/2)^2