Number of atoms in a cell

[mee]

I know there are trillions of cells in an adult human body but how many atoms are in each cell?

[Monique]

Very crude: What does the average adult weigh, devide by the number of cells. What are the most common atoms in a cell and what are their relative abundancies, what do they weigh on average. Divide the weight of a cell by the average weight of the atoms represented in a cell.. and there you get your number :)

Maybe someone already figured it out and you can find it on Google :)

[arildno]

Even cruder, but it should be an upper bound on the number of atoms in a cell:
Let V be the average volume of a cell.
Then we should have the inequality for the number n atoms in a cell:
n\leq\frac{V}{\frac{4}{3}\pi{R}^{3}}

Where R is an average value for an atomic radius

[Monique]

But how much space is taken up by the 3D structure of a molecule, and how much space is there between molecules..

[arildno]

That's why it's such an awfully crude upper bound :smile: