Physics Flashcards
1 Atmosphere =
10.08m
33.07 feet of seawater
33.90 feet of freshwater
1.033 kg/cm2
14.7 psi
1.013 bar
101 lap
760 mmHg
Absolute pressure
Relative to a vacuum
Gauge pressure
Relative to atmospheric pressure
What is 640ppm expressed as a %
0.065
What is 21% O2 expressed as a decimal percentage
0.21
You wish to press a 20m3 chamber to 70m and establish a PPO2 of 0.4bar. Using 12/88 and 2/98 heliox. To what depth do you press with 12/88?
(210-400)- ( 70x 2)
—————————
(12-2)
190-140
—————
10
50
——
10
=5m
At Sat system has three 15m3 chambers, a 10m3 TUP and a 6m3 bell. How much gas to press to 180msw?
3x15= 45+10+6 = 65m3
(180 divided by 10)= 18
18 x 61= 1098m3
1ATA to PSI
14.7 PSI
23°C to °F
(23x1.8)+32= 75°F
36°C to KELVIN
36 + 273= 309K
79°F to Rakin
79+ 460= 539R
101°F to °Celsius
(101-32) divided by 1.8=38.29°C
298K to °C
298-273= 25°C
1ATA to PSI
14.7PSI
88.2PSI(A) to FSW
88.2 /33-1= 1.67= 167.2FSW
2000 Litres(FW) to M3
2M3
99 FSW to ATM
99/33= 3ATM
1Ft3(SW) to Lb
64.38Lb
1M3 (SW) to Te
1.03Te
99FSW to ATA
4ATA
30MSW to BAR(G)
3BAR(G)
30MSW to BAR(A)
4 BAR(A)
1 BAR is equal to
750mmHg, 14.5Psi
What is the PPO2 in a 5% mix at 300ft?
PPO2=(300+33/33)x5%
=10.09x 0.05
=0.504
=504mb
How much would an object 15m x 4m x 3m, and a density of 3800kg/m3 weigh in fresh water
15x4x3x3800= 684000kg
15x4x3x1000= 180000kg
684000-180000= 504000kg
=504Tonnes
A chamber is at 50msw, the internal temperature is 20°C. If it drops to 17°C what will the new depth be?
P2=P1T2/T1
=6x(273+17)/(273+20)
=6x290/293
=49.3msw
A diver is at 100msw with a 15 litre bailout bottle charged to 210bar. What volume of gas is available to him?
100msw=11bar
Reg=10bar
210-11-10=189bar x 15litre=
2835litre available
Or 2.835m3
How long would a 15 litre bailout pumped to 210 bar last at 100msw?
100msw = 11bar
-Reg=10bar
Breathing Rate 40L/min x11bar= 440L/min
(210-11-10)x15=2835/40=6.443
6minutes (.443x60)=26seconds
How much gas will a diver at 90 FSW use over 45 minutes?
90+33/33= 3.72ATA
1.25ft3/minute x 3.72= 4.65ft3/minute x 45=209Ft3
A bellman reports a CO2 level of 2480 PPM in the bell at 90m. What is the PPO2 as a %
2486 x 10000= 0.2480= 0.2480%
