How many oxygen atoms are there in the human body?

Answer 1

Would you settle for a whole bunch? I didn't think so. The number of atoms in one person is almost too big to write out. But fortunately there's a shorthand system, called scientific notation, that we use instead for writing really BIG or really SMALL numbers. Since huge numbers are generally just estimates anyway, we just use the first few numbers, followed by a code that tells you how many zeros would follow if you wrote it all out. Ok, here it goes. Hydrogen, oxygen and carbon make up about 99% of the average human. I'm going to cheat a little and leave out the other 1%, which is made up of trace elements (that is, stuff there's only a trace of in the body). Then, let's assume an average adult weighs 70 kilograms. Be sure to keep in mind that the following numbers are based on the number of atoms, not percent of body weight (by weight we are mostly oxygen). A 70 kg body would have approximately 7*1027 atoms. That is, 7 followed by 27 zeros:

7,000,000,000,000,000,000,000,000,000

Of that, 4.7*1027 would be hydrogen atoms, which have one proton and one electron each. Another 1.8*1027 would be oxygen, which has 8 protons, 8 neutrons and 8 electrons. There are 7.0*1026 carbon atoms, which have 6 protons, 6 neutrons and 6 electrons. Now, let's add that all up:


Protons Neutrons Electrons

Hydrogen 4.7*1027 0 4.7*1027

Oxygen 1.4*1028 1.4*1028 1.4*1028

Carbon 4.2*1027 4.2*1027 4.2*1027

Total 2.3*1028 1.8*1028 2.3*1028


Well, you'll have to agree that really is a whole bunch.

Answer 2

How many atoms are in the human body?

"Answer 1

Would you settle for a whole bunch? I didn't think so. The number of atoms in one person is almost too big to write out. But fortunately there's a shorthand system, called scientific notation, that we use instead for writing really BIG or really SMALL numbers. Since huge numbers are generally just estimates anyway, we just use the first few numbers, followed by a code that tells you how many zeros would follow if you wrote it all out. Ok, here it goes. Hydrogen, oxygen and carbon make up about 99% of the average human. I'm going to cheat a little and leave out the other 1%, which is made up of trace elements (that is, stuff there's only a trace of in the body). Then, let's assume an average adult weighs 70 kilograms. Be sure to keep in mind that the following numbers are based on the number of atoms, not percent of body weight (by weight we are mostly oxygen). A 70 kg body would have approximately 7*1027 atoms. That is, 7 followed by 27 zeros:

7,000,000,000,000,000,000,000,000,000

Of that, 4.7*1027 would be hydrogen atoms, which have one proton and one electron each. Another 1.8*1027 would be oxygen, which has 8 protons, 8 neutrons and 8 electrons. There are 7.0*1026 carbon atoms, which have 6 protons, 6 neutrons and 6 electrons. Now, let's add that all up:
ProtonsNeutronsElectrons
Hydrogen4.7*102704.7*1027
Oxygen1.4*10281.4*10281.4*1028
Carbon4.2*10274.2*10274.2*1027
Total2.3*10281.8*10282.3*1028

Well, you'll have to agree that really is a whole bunch.

Answer 2

As they say in French - "Beaucoup," meaning a lot! A very technical, but very interesting, discussion of this can be found at http://www.foresight.org/Nanomedicine/Ch03_1.html. In summary, for a typical human of 70 kg, there are almost 7*1027 atoms (that's a 7 followed by 27 zeros!) Another way of saying this is "seven billion billion billion." Of this, almost 2/3 is hydrogen, 1/4 is oxygen, and about 1/10 is carbon. These three atoms add up to 99% of the total!

The web site gives a detailed list of the all the different kinds of atoms making up the human body (there's even some uranium in us!) More importantly, this site is an introduction to a very new area of medical research named Nanomedicine which can be defined as "the monitoring, repair, construction and control of human biological systems at the molecular level, using engineered nanodevices and nanostructures." Anyone who has watched the Star Trek TV shows has certainly come across this idea in some of the "Borg" episodes."

Answer 3

I may not have read the other answers correctly, but you also have to add in oxygen in the lungs, which is the lung volume, I'm guessing 7 liters. Half of the time it's air oxygen concentration 21% and half it's exhaled air ~15%. so it's half the volume 3.5L x .21 because air is 21 % oxygen. Ideal gas says 1 mol is in 1L I believe. then the other half of the lung volume 3.5L x .15 for exhaled air. Then added PO2 from blood volume. I think blood volume is around 5L. 1/3 of blood volume is arterial. PO2 in arterial is about 100mmHG, while the other 2/3 is venus blood which is 2/3 blood volume at about 40 PO2. I'm not going to do the math, but you would probably add these values, to the other answers. But I'll humbly say this may have already been taken into account.

Answer 4

""seven billion billion billion." Of this, almost 2/3 is hydrogen, 1/4 is oxygen, and about 1/10 is carbon. These three atoms add up to 99% of the total!"

7,000,000,000,000,000,000,000,000,000
divided by 4 = 1.8*10 to the 27th of Oxygen atoms

Answer 5

There is no set amount of oxygen atoms because we are ALWAYS breathing in and out the oxygen atoms, they leave and come back, but there is probably over 5,000,000,000.

Answer 6

God only knows....I know that I don't.

All I can say is that all those muscles Hulk Hogan has, then he has more oxygen atoms than me. It is impossible to quantitatively measure this out.

Answer 7

Enrico Fermi would have loved this question.