Physiology of Diving
o External pressure on airspace (attached or natural) is > than internal.
Air in middle ear is at 1 atm of pressure.
As dive, outside P increases. Middle air remains 1 atm.
Drum begins to flex inwa
o Distinct Change in water temperature.
o 25 and 60 ft 7ft
o Layer of fresh water atop layer of salt water
o Causes distorted vision
Salt and fresh water mix and causes heat wave like effect
Daltons law: Pressure of mixture of gasses will = sum of partial pressures.
o Air 20% O2 80% N @ 1000PSI
200PSI O2 800PSI N
o Not % of gas that has effect on body, its the partial pressure.
o Hemoglobin doesnt care about N levels
THE BENDS (DECOMPRESSION SICKNESS)
will see in form of rash and itch called skin bends, accompanied by aching in joints
tendency for new divers is to follow dive master and youll be safe, but you need to
calculate your own times and depths
1. CLOSED ENVIRONMENT: quarry (generally where youll do 1st dive, then do off shore)
a. Dutch Springs (if do dive with Mike). its an old limestone quarry: digging giant well,
sooner or later you hit water. keep digging and pump
Loss of ability to think quickly, euphoria. Like effects of alcohol. Youll have trouble
recognizing symptoms in yourself. Will effect diff ppl at diff depths (smaller body weight
seems to be effected more quickly)
130 ft is what we con
CARBON MONOXIDE POISONING: how does CO get into tank? if high level of CO in
air thats being pumped into tank OR if compressor being used is driven by gasoline or
diesel engine (CO is created when fossil fuels dont burn completely-produc
THE PHYSIOLOGY OF DIVING
DIRECT EFFECTS OF PRESSURE ON BODY
Boyles Law: pressure up, volume down, density up AND pressure down, volume up,
SQUEEZE: when external pressure on air space becomes greater than internal pressure
PHYSICS OF DIVING
Our bodies our designed to work in gaseous atmosphere (20% oxygen, 80% hydrogen-air) and under about 15 pounds (?) of pressure
Matter=anything that occupies space and has weight (eg. air is matter, full scuba tank
weighs 6 po
PERSONAL ITEMS (Mask, n, snorkel)
Mask: allows us to see clearly underwater (puts air in b/t water and eyes.) Proper seal
and t is most important thing. Skirt is rubber part around frame of mask. Inhale and
make sure mask sticks to face (