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An average adult breathes about 0.5 L of air per breath at rest. Normal air contains ~ 0.03 % of CO2 which gets enriched to 4 % of exhaled air. The difference, 3.97 % is what you exhaled. One mole of air at room temperature have a volume of ~22.4 L (use ideal gas equation p*V=n*R*T, p=pressure [bar], V=volume, n=amount in mole, R=ideal gas constant, T=temperature [Kelvin]). 1 mole CO2 is equivalent to 44 g.

So, 0.5 L*(1 mole /22.4 L)*(44 g / mole) = 0.982 g

One breath therefore contains ~ 1 g of exhaled CO2

Note: Some of the gases are not ideal (mostly CO2), the volume of one breath depends on the person (sex, age, fitness, size) and the activity. It can be up to 2 L at least. But it is just an approximation anyways.

Btw - 1 kWh of electricity cost about 600 g of CO2. An average light bulb of 60 W therefore gives rise to the production of 10 g CO2 / s during use (not counting its production or disposal).

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If one breath is 4% CO2 and 1 breath is 0.5 liter, Mass of CO2 = 0.04*0.5 L* (1/22.4) mol/liter* 44 g/mol * (273 K/310 K) = 0.035 g/breath, not 1 g/breath. Body temp is 37 oC = 310 K, but that's a minor point.

If 1kWh results in 600 g of CO2, 60 Watts leads to 60W*600 g/kWH *(1/3600) h/sec *(1/1000) kw/W= .01 grams/second of CO2 not 10 g/sec. Otherwise people may feel guilty about breathing.

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some serious problems with the decimal place in the original answer. atmospheric content co2 is roughly 350 PPM or .00035, less than the original answer by several orders of magnitude. maybe that's why all the histeria about global warming, smoking in the boys room during middle school math....

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Q: How much CO2 is emitted per breath?

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18 & 1/2 tons per second. All in all there's about 2875640 Billion tons of co2 emitted everyday.

Doesn't the driver ( and any passengers ) in the car emit CO2 as well, so you are not comparing like with like.You must compare CO2 from Car, driver and passengers with CO2 emitted by cyclist to be more accurate.You will need to divide the CO2 for car driver and passenger by number of occupants of car to get CO2 per person per journey

It would depend on the person's size and how active they are. Find the CO2 rates for an hour during sleep and being awake, multiply them by whatever you need and you'll figure out an annual estimate. However, a rough estimate (curtesy of "The Earth Blog") assuming 12 breaths per minute (resting breath rate) is 500kg The number is easy to estimate: breaths per minute x CO2 per breath x minutes per year From Wiki - the breath rate is 12 to 25 per minute. Size of breath is 500 mL. Percent CO2 exhaled is 4% so CO2 per breath is approx 0.04g ( 2g/L x .04 x .5l). CO2 Per year= 12 x 0.04 x 525600 (minutes per year) = 252kg/yr CO2 (25 breaths) = 525 Kg/yr. So - pick a number between 252 Kg/yr and 525Kg/yr 1000 lbs/year is a good figure of merit.

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Too much !

A Hummer parked in a garage emits almost zero CO2 over the course of a year. The Hummer H2 gets around 10 to 12 mpg. Assuming the typical owner drives 15,000 miles per year, that is around 1300 gallons of gas. Each gallon of gas burned results in 14 pounds of CO2. Multiplying these last two figures we get 9.5 tons of CO2 emitted per year, per Hummer, on average.

To obtain the number of grams of CO2 emitted per gallon of gasoline combusted, the heat content of the fuel per gallon is multiplied by the kg CO2 per heat content of the fuel. The average heat content per gallon of gasoline is 0.125 mmbtu/gallon and the average emissions per heat content of gasoline is 71.35 kg CO2/mmbtu.

coca cola can contain anywhere between 4-7 grams of CO2 per ml.

The UK produces about two per cent of the world's CO2 emissions. Only two per cent of the UK's CO2 emissions derive from private motorised transport.

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