Question

Here it is: The scale bar has a width of 20 micrometers, or 20 μm. (There are 1,000 micrometers in a millimeter.) Using the scale bar, about how wide is a human skin cell?

Answer 1

Explanation:

Working out magnification:

Measure the scale bar image (beside drawing) in mm.

Convert to µm (multiply by 1000).

Magnification = scale bar image divided by actual scale bar length (written on the scale bar)

Answer 2

We want to use the given image to estimate the width of the cell.

We will get the estimation of 24 μm

We know that the bar represents 20 micrometers, now we can just measure that bar with a ruler, from this, we see that the bar measures 2.5cm, so we can write the relation:

2.5cm = 20 μm

Then:

1cm = (20/2.5) μm = 8μm

Now we just need to measure the skin cell width with the same ruler, and then transform that to micrometers.

My measure says that the width is approximate 3cm, and each cm represents 8 μm, then the cell width is:

3*8μm= 24 μm

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