SSI course The Science of Diving
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| Pressure | Pressure=Force/Area or P=F/A
🗑
|
||||
| Atmospheric Pressure | Air pressure at sea level. expressed as 1 ATA
🗑
|
||||
| Hydrostatic Pressure | The weight exerted by a fluid due to the force of gravity
1 ata=34 feet of fresh water (ffw)
1 ata=33 feet of salt water (fsw)
🗑
|
||||
| Fresh water | exerts 14.7 psi/34 ffw = .432psi/ft
🗑
|
||||
| Salt Water | exerts 14.7 psi/33 fsw = .445psi/ft
🗑
|
||||
| Gauge pressure | pressure does not take in to account atmospheric pressure (mostly for divers information)
🗑
|
||||
| Absolute Pressure | The total pressure exerted on an object
Absolute pressure (ata)=Depth (fsw)/(33fsw/ata)+1
🗑
|
||||
| Formulas for Converting Pressure | Pressure(ata)=(D/33ft) + 1
D=(ata)-1) x 33 ft
🗑
|
||||
| Convert from Celsius to Fahrenheit | F=(C x 1.8) + 32
🗑
|
||||
| Convert from Fahrenheit to Celsius | C=(F - 32) / 1.8
🗑
|
||||
| Degrees Kelvin | Degrees Kelvin=C + 273
🗑
|
||||
| Degrees Rankine | Degrees Rankine = F + 460
🗑
|
||||
| 1 liter | 1000 Cubic centemeters
🗑
|
||||
| 1 cubic foot | 1728 cubic inches
🗑
|
||||
| 1 cubic yard | 27 cubic feet
🗑
|
||||
| 1 statute mile (land) | 5280 feet
🗑
|
||||
| 1 nautical mile | 1.151 Statute Miles
🗑
|
||||
| Density | Mass/Volume
🗑
|
||||
| Components of Air | Nitrogen = 78.08%
Oxygen = 20.94%
Argon = 0.93%
Carbon Dioxide = 0.03%
Other Gases = 0.02%
🗑
|
||||
| Hypoxia | Not enough O2 to support life at low partial pressures= unconsciousness and death
🗑
|
||||
| Hyperocia | Too much O2 at high partial pressure. = pulmonary ore central nervous system toxicity.
🗑
|
||||
| Pressure | Always referred to as (P)
P= (Depth/33) + 1
Depth =(P-1) x 33
🗑
|
||||
| Boyle's Law | If the temperature remains constant the pressure and volume of any gas are inversely related, ie..
as the pressure increases, the volume decreases and if the volume increases the pressure decreases.
🗑
|
||||
| Boyle's Law formula | P1 x V1 = P2 x V2
🗑
|
||||
| Charles' Law | If the pressure of a gas is constant, then the volume of the gas varies directly with temperature.
🗑
|
||||
| Charles' Law formula - Constant volume | P1 / T1 = P2 / T2
🗑
|
||||
| Charles' Law formula - Constant pressure | V1 / T1 = V2 /T2
🗑
|
||||
| General Gas Law formula | (P1 x V1) / T1 = (P2 x V2) / T2
🗑
|
||||
| Henry's Law | The amount of gas that will dissolve in a liquid is directly proportional to the partial pressure of that gas, given that the temperature and the molecular movement (agitation) of the liquid are constant
🗑
|
||||
| Dalton's Law | In a mixture of gases, the total pressure (P) of the mixture equals the sum of the partial pressures (pp) of the individual gases.
ppgas 1 + ppgas 2 = P
🗑
|
||||
| Dalton's Law formula | ppgas = P x fgas
fgas = the fraction of gas in the mixture expressed as a decimal
also
P = ppgas / fgas
🗑
|
||||
| Buoyancy | is the force by which an object floats or sinks, there are three kinds of buoyancy:
🗑
|
||||
| Neutral Buoyancy | Will remain suspended at the same depth it was placed.
🗑
|
||||
| Negative Buoyancy | Will sink when placed in fluid.
🗑
|
||||
| Positive Buoyancy | Will rise toward the surface, at the surface will remain floating.
🗑
|
||||
| Archimedes' Principle | An object placed in liquid will be buoyed up by a force equal to the weight of the liquid it displaces.
🗑
|
||||
| Archimedes' formula | B = (VO x DL) - WO
B = Bouyant force
VO = Volume of the object
DL = Density of the liquid
WO = Weight of the object
🗑
|
||||
| Density of salt water | 64 lbs /cu ft
🗑
|
||||
| Density of fresh water | 62.4 lbs / cu ft
🗑
|
||||
| Surface air Consumption Rate | SAC = (AC / T) / D
SAC = Surface air consumption rate
AC = Air consumed in psi
D = Depth expressed in bar or (fsw /33) =1
T = time
🗑
|
||||
| Formula to find time | T = AC /(SAC x D)
🗑
|
||||
| Formula to find the air Consumed | AC = SAC x D x T
🗑
|
||||
| What changes the appearance of the environment under water | Refraction
Diffusion
Turbidity
Absorption
🗑
|
||||
| Sound | Travels 4x faster in water than it does in air and sound delay is 1/4 that of air so it is hard to determine which way the sound comes from.
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
nemery12
Popular Science sets