# The Naked Scientists Forum

### Author Topic: How many people can fit in a room before oxygen supply is a problem?  (Read 3769 times)

#### chris

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##### How many people can fit in a room before oxygen supply is a problem?
« on: 19/06/2009 09:01:30 »
How many people could be put into a room before the amount of oxygen able to move into that room becomes a problem? In very densely packed buildings is there a measurable drop in oxygen and a rise in CO2?

Chris

#### RD

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #1 on: 19/06/2009 09:23:36 »
One person in an air-tight room will have "a problem", (unless it's a greenhouse with plants producing oxygen).

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #2 on: 20/06/2009 06:17:23 »
Indeed, it would depend entirely on the ventilation of the room. The problem would probably be high CO2 levels rather than low oxygen levels though

#### JnA

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #3 on: 20/06/2009 06:32:11 »
One would think that any measurable drop in an office building (say) would occur when the 'rush' of morning workers occurs.. then it would stabilise through out the day then perhaps another measurable change when they all leave. (assuming the greatest number arrive and leave at about the same time)

I guess a good place to test this would be in an aeroplane before it leaves the ground.

#### JnA

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #4 on: 20/06/2009 06:41:37 »
or an elevator...

#### RD

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #5 on: 21/06/2009 07:47:28 »
Russian "BIOS-3" closed ecosystem (air tight)...

Quote
Chlorella algae were used to recycle air breathed by humans, absorbing carbon dioxide and replenishing it with oxygen through photosynthesis. The algae were cultivated in stacked tanks under artificial light. To achieve a balance of oxygen and carbon dioxide, one human needed 8 square metres (about 86 sq ft) of exposed Chlorella.
http://en.wikipedia.org/wiki/Bios_3
« Last Edit: 21/06/2009 07:53:12 by RD »

#### lyner

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #6 on: 21/06/2009 23:41:51 »
That figure only goes to show that a few plants in an ordinary room can't be doing much real good - apart from, perhaps, providing a pleasant 'outdoor' smell. People used to take them out of bedrooms at night - in case they "used up all the Oxygen" I ask yer!
The Russian exercise, using kW of lighting power indicates that, to do the same thing an a spacecraft (Earth distance from the Sun) you'd need many squ metres of plants per person if using Sunlight. Sounds a bit like that film with Bruce Dern (title?)

#### Edster

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #7 on: 22/06/2009 11:46:38 »
silent running pops into head. 90% likely.

The real film  from that period was dan O bannon`s Dark star which is  darkly funny, not seen on DVD yet.
« Last Edit: 22/06/2009 11:50:47 by Edster »

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##### How many people can fit in a room before oxygen supply is a problem?
« Reply #7 on: 22/06/2009 11:46:38 »