Human Life Support Needs

(Updated 26 February 2013)

Reference:
ECLSS Slide, NASA JSC (PNG)

Requirements for Life


Imperial/US

Metric

Food

1.36 lb lb/person/day

0.62 kg/person/day

Water

7.78 lb/person/day

3.53 kg/person/day

Oxygen

1.82 lb/person/day

0.83 kg/person/day

Temperature

64° to 81°F

18° to 27°C

Humidity (% H2O)

25 to 75

25 to 75

Total Atmospheric Pressure

7.5 to 15.0 psia

51.71 to 103.42 kilopascals

Partial Pressure, O2

2.48 to 3.44 psia

128 to 178 mm Hg

Partial Pressure, CO2

≤ 5mm Hg

≤ 0.096 Hg

Waste Given Off


Imperial/US

Metric

Fecal

0.24 lb/person/day

0.11 kg/person/day

Urine/Sweat/Respiration

8.53 lb/person/day

3.87 kg/person/day

CO2 + O2

2.49 lb/person/day

1.13 kg/person/day