Consumo de oxigeno

How much oxygen does a person consume in a day?



The average adult at rest inhales and exhales something like 7 or 8 liters (about one-fourth of a cubic foot) of air per minute. That totals something like 11,000 liters of air (388 cubic feet) in a day.
The air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each breath and converted to carbon dioxide. Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.
A person who is exercising obviously uses a lot more oxygen than that. You could determine how much air is moving through your lungs by exhaling into a plastic bag of known volume at each breath and seeing how long it takes to fill the bag.



http://health.howstuffworks.com/question98.htm



TREE FACTS

Amazing Tree Facts
(from the New York Times)
A mature tree removes 48 pounds of carbon dioxide (C02) per year from the air (roughly 10 tons per.acre).
The amount of carbon stored annually by an acre of trees is approximately equal to the amount released by burning 1,000 gallons of gasoline.
A tree that provides shade and wind protection to buildings can indirectly cause, via energy conservation, reductions in carbon dioxide emissions equal to 15 times the amount of carbon dioxide the tree will absorb.(from Journal of Arboriculture V. 16(6) 1990 p. 144)
One acre of trees annually consumes the amount of carbon dioxide equivalent to that produced by driving an average car for 26,000 miles. That same acre of trees also produces enough oxygen for 18 people to breathe for a year.
A deciduous tree, like the American beech, that is 80-100 years old has about 1,600 square yards of leaf surface area to which dust particles can adhere.
A healthy tree stores about 13 lbs. of carbon each year, and a healthy acre of trees can store 2.6 tons of carbon a year.
It takes the wood from a 100-foot tree to keep the average American supplied for a year with newspaper, books, magazines, tissues, paper towels, housing materials, furniture, desks, fences, boxes and other assorted wood products. On the average that use amounts to:
613 lbs. of paper products
200 square feet of 1" thick lumber
87 square feet of plywood
59 square feet of insulation board, particle board and hardboardVital statistics for that 100-foot tree:
18" in diameter at the base
100 feet tall with a 60-70 foot crown spread 0 weighs about 4,100 lbs. at harvest
grew 200,000 leaves @ 120 lbs. per year or 3,600 lbs. over its lifetime
1,300 lbs. of roots (an additional 2,000 lbs. were grown and discarded)
100 lbs. of nutrients retained in the wood (twice that amount were returned to the soil)
took up over 5,000,000 gallons of water from the soil and transpired it into the air; 350 gallons of water (2,900 lbs.) were retained
6,000 lbs. of oxygen given off

http://forestmanagement.enr.gov.nt.ca/forest_education/amazing_tree_facts.htm