What pressure increase occurs for every 10 metres of seawater?
1 bar
What pressure increase occurs for every 33 feet of seawater?
1 atmosphere
What is absolute pressure?
Gauge pressure plus atmospheric pressure
What is surface atmospheric pressure in bar?
1 bar
What is surface atmospheric pressure in psi?
14.7 psi
How do you calculate absolute pressure in msw?
(Depth ÷ 10) + 1 bar
How do you calculate absolute pressure in fsw?
(Depth ÷ 33) + 1 atm
Which pressure is used for gas volume calculations in quads?
Gauge pressure
Which pressure must be used for partial pressure calculations?
Absolute pressure
What is free gas volume?
Gas volume expanded to surface pressure
What is the standard diver breathing rate for planning?
35 litres per minute
What breathing rate is used for emergency calculations?
40 litres per minute
How do you calculate diver gas consumption?
Absolute pressure × breathing rate
What happens to gas consumption as depth increases?
It increases proportionally
How do you calculate time available from a gas supply?
Gas available ÷ gas consumption
What law explains pressure and volume relationship?
Boyle’s Law
What law
