In a room shaped like a cuboid with a length of 14m, width 7m and 3.5m height are 40 students and teacher. It is known that the air in a room becomes dangerous when breathing in every cubic meter of air contains carbon dioxide 4dm3. It is known that each person 16h expire in a minute cite 0.5 dm3 air containing 5% carbon dioxide. In these conditions, determine the maximum tolerable as room is not ventilated.
RE: In a room as a cuboid with fresh air
Air volume of the cuboid: 14 * 7 * 1.4 = 343 m3.
As the air becomes dangerous => 343 * 4 = 1372 dm3 CO2.
A man produces 16 breaths per minute: 16 * 0.5 = 8 dm3 of which 5% is CO2 => 0.4 dm3 CO2.
In total there are 40 + 1 = 41 persons => 41 * 0.4 = 16.4 dm3 (the maximum administrative).
Dividing 1372 to 16.4 => 83 658 min => 83.65 min (after 83 minutes).
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