erectus/life-support

21% normal
5% consumption
volume of breath? 6 litres
16 breaths per minute
our units are approximately 1/5 a litre

6 * 1/5 * 16 / 60 * 0.05 = oxygen per second rate = 0.016

co2
> 0.0008 is unhealthy
> 0.005 is very unhealthy
> 0.05 is dangerous to animal life (becomes uncomfortable as well)
> 0.084 for 60 minutes = death
> 0.1 is immediately dangerous

o2 below 19.5% is considered dangerous
0.47 pressure at 21% is lowest pressure
- 5 to 8 psi for 100% is tolerable (1 psi = 0.068046 atm)
  (should be roughly 0.12 atm (minimum at 100%))
2.5 atm at 21% should be a safe maximum, short periods in excess of 70 atm are tolerable

Min Pressure: 0.12 atm with pure oxygen
Max Pressure with pure oxygen: 0.5 atm
Min Pressure w 19.5-21%: 0.47 atm
Max Pressure with 19.5-21%: 2.5 atm
- draw a box, current point has to be in the box? NO
if oxygen < 0.195 -> dying
if pressure < 0.12 -> dying
if pressure < 0.47
  if oxygen < -2.3(pressure) + 1.276 -> dying
if pressure > 0.5
  if oxygen > -.054(pressure) + 0.33 -> oxy toxicity
if pressure > 2.5 -> oxy toxicity

min pressures: 0.12 and 0.47
max pressures: 0.5  and 2.5
min percents:  1    and 1
max percents


feces
  3-8oz per day -> * 0.0295735 / 5 = volume units
  = 0.03253085 / 24 / 60 / 60 = 3.7651446759259e-07 per second
  75% water, 25% solid (below list)
0.3 -> bacteria
0.3 -> cellulose (can be burned -> co2 h2o)
0.1-0.2 -> fats
0.1-0.2 -> phosphates (iron/calcium)
0.02-0.03 -> proteins

(one urination ~ 0.35 / 5 volume)
 per day => 0.8 to 2 litres
 per second = 3.2407407407407e-06
urine
~0.04 urea (ammonia/co2)
~0.01 salt, potassium
0.95 water

0.4 litres of water expelled in breath per day
per second: 0.4 / 5 / 24 / 60 / 60 = 9.2592592592593e-07