The average diameter of a red blood cell is approximately 6 to 8 micrometers (µm). To convert micrometers to millimeters, you can use the conversion factor that 1 millimeter (mm) is equal to 1000 micrometers (µm).
So, to convert 6 to 8 µm to mm:
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For 6 µm:
\( 6 , \text{µm} = \frac{6}{1000} , \text{mm} = 0.006 , \text{mm} \) -
For 8 µm:
\( 8 , \text{µm} = \frac{8}{1000} , \text{mm} = 0.008 , \text{mm} \)
Therefore, the size of red blood cells in millimeters is approximately 0.006 to 0.008 mm.