Diving Equations

Water Compared To Air

PROPERTY

AIR

WATER

COMPARISON

Density

0.08 per cu.ft.

62.4 - 64.0

800 TimesDenser
Compressible?

Yes

No

Air Varies/Water Constant

Light Speed

180,000 MPH

135,000 MPH

25% Slower in Water

Absorption

Low

High

Color Absorbed Rapidly

Speed of Sound

1125 ft. per sec.

4900

>4 Times Faster

Thermal Conductivity

0.17

3.86 - 4.12

22 - 24 Times Faster

Heat Capacity

0.24

0.94 - 1.0

4 Times Greater

Diving Conversions

ATA to Depth (ATA - 1) x 33 = Depth
ATA to PSIg (ATA - 1) x 14.7 = PSIg
Depth to PSIg Depth x 0.445 = PSIg
Depth to ATA Depth + 33 ÷ 33 = ATA
PPM to % Move the decimal 4 places to the left OR ÷ by 10,000
PSIg to Depth PSIg ÷ 0.445 = Depth
SAC= Air Used (PSI) @ Given Depth, x33, then ÷ by the depth +33
PSIg to ATA PSIg + 14.7 ÷ 14.7 = ATA

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