Question

A human hair has a thickness of about 90 μm. What is this in millimeters?

A) 0.09 mm
B) 0.9 mm
C) 9 mm
D) 90 mm

Answer 1

The diameter of a human hair is about 90 µm, which is equal to 0.09 mm.

Step-by-step explanation:

The diameter of a human hair is about 90 µm.

To convert micrometers to millimeters, we need to divide the given value by 1000, since there are 1000 micrometers in a millimeter.

Therefore, 90 µm is equal to 0.09 mm.