How many microns are in 20 millimeters?

How many microns are in 20 millimeters?

• A. 2 um
• B. 20,000 um
• C. 2,000 um
• D. 200 um

Answer: (B)

Micrometer is 1/1000 of a millimeter, so the relationship is 1 mm = 1000 μm. Multiply by 1000: 20 mm × 1000 = 20,000 μm. Quick checks: 2 μm is 0.002 mm, 2,000 μm is 2 mm, and 200 μm is 0.2 mm. The correct conversion gives 20,000 μm.

Micrometer is 1/1000 of a millimeter, so the relationship is 1 mm = 1000 μm. Multiply by 1000: 20 mm × 1000 = 20,000 μm. Quick checks: 2 μm is 0.002 mm, 2,000 μm is 2 mm, and 200 μm is 0.2 mm. The correct conversion gives 20,000 μm.