Physics Flashcards
State Boyles law
Volume and Pressure
Normal gas consumption
Metric/Imperial
35L/min
1.25ft3/min
Emergency breathing rate
Metric/Imperial
40L/min
1.5ft3/min
Density of water
Salt
Fresh
Salt Water;
64.38Lbs
1030kg/m3
1.03T/m3
Fresh Water;
62.5Lbs
1000kg/m3
1.0T/m3
Bar and ATA required to drive the demand valve
10bar or 10ata
Celsius to Kelvin
+273
Fahrenheit to Rankin
+460
Convert 500ppm to %
500 / 10,000
= 0.05%
Chamber @80msw
Analyzer reads 400ppm
What is the ppCO2?
Convert ppm to % then simple T formula.
400ppm / 10,000 = 0.04%
90msw x 0.04 =
3.6mb
Chamber @80msw
With 4.5% O2
What is the ppO2?
90 x 4.5% = 405mb
Or
9 x 0.045 = 0.405bar
Max ppO2 diving
1.4bar
1400mb
Max ppm CO2
5000ppm surface equivalent
When venting chambers what happens to the;
% and partial pressure
% stays the same
pp will fall
State the 3 methods of heat transfer
Conduction
Convection
Radiation
2% CO2 on surface analyzer equals x at 28msw
3.8 x 2 = 7.6%
Convert Fahrenheit to Celsius
And vice versa
F = temp x 1.8 + 32
C = temp - 32 / 1.8
Metabolic 02 rate
Regardless of depth;
0.5L/min
30L/hr
0.72m3/day
Or 25ft3/day
Formula used to Calculate volume of a cylinder
Pi x radius squared x height
Normal gas consumption
Metric/Imperial
35L/min
1.25ft3/min
Emergency breathing rate
Metric/Imperial
40L/min
1.5ft3/min
Density of water
Salt
Fresh
Salt Water;
64.38Lbs
1030kg/m3
1.03T/m3
Fresh Water;
62.5Lbs
1000kg/m3
1.0T/m3
Bar and ATA required to drive the demand valve
10bar or 10ata
Celsius to Kelvin
+273
Fahrenheit to Rankin
+460
Convert 500ppm to %
500 / 10,000
= 0.05%
Chamber @80msw
Analyzer reads 400ppm
What is the ppCO2?
Convert ppm to % then simple T formula.
400ppm / 10,000 = 0.04%
90msw x 0.04 =
3.6mb
Chamber @80msw
With 4.5% O2
What is the ppO2?
90 x 4.5% = 405mb
Or
9 x 0.045 = 0.405bar
Max ppO2 diving
1.4bar
1400mb
Max ppm CO2
5000ppm surface equivalent
When venting chambers what happens to the;
%
And
pp
% stays the same
pp will fall
State the 3 methods of heat transfer
Conduction
Convection
Radiation
2% CO2 on surface analyzer equals x at 28msw
3.8 x 2 = 7.6%
Convert Fahrenheit to Celsius
And vice versa
F = temp x 1.8 + 32
C = temp - 32 / 1.8
Metabolic 02 rate
Regardless of depth;
0.5L/min
30L/hr
0.72m3/day
Or 25ft3/day
Formula used to Calculate the volume of a cylinder
Pi x radius squared x height
(If using imperial, convert to ft/in into decimals)
State the density of Sea Water and Fresh Water;
Sea Water;
1030kg/m3 or 1.03T
64.38lbs/ft3
Fresh Water;
1000kg/m3 or 1T
62.5lbs/ft3
Metric Ton vs Imperial
Metric Ton;
2240lbs / 1000kg
Imperial Ton;
2000lbs
