I am doing an experiment in which I plate for example 3x10^5 cells, and every day I have to count the cells growing. I find the number and a convert it in x10^5. In my graphs I have to use the cell concentration. I am not sure which units are used for cell concentration. Is it ml, μl or anything else?
closed as off-topic by David, Amory, Bryan Krause♦, kmm, theforestecologist♦ Feb 16 '18 at 2:31
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What is a concentration
A concentration of cells is the number of cells per unit of volume.
You are free to choose the units you like
It is very much up to you to chose the units you want as long as they express a concentration. There is no right or wrong.
You can express your graph in cells per liter or in 100,000 cells per $\mu$l or in billions of cells per ml, all would be correct. Of course, some are more intuitive than others. I would advice you to avoid expressing in cell per square meter or in billions of cells be nanoliter because the numbers will be very small and very large respectively and will not convey much intuition.
A good intuitive unit
I don't know what kind of concentration you have in you data but a priori, I would recommend expressing your concentration in cells/ml is quite intuitive.