In the size example, which unit is abbreviated as mcm?

In the size example, which unit is abbreviated as mcm?

• A. Meter
• B. Nanometer
• C. Micrometer
• D. Millimeter

Answer: (C)

Understanding metric prefixes and unit abbreviations helps you read measurements accurately. The prefix micro denotes 10^-6, so a micrometer is one millionth of a meter. The common symbol is μm, but in some plain-text contexts you might see it written as mcm. That’s why mcm is used to represent a micrometer here. Nanometers are written as nm (10^-9 meters), and millimeters as mm (10^-3 meters), so micrometer sits between those two in size. Therefore, the abbreviation mcm corresponds to the micrometer.

Understanding metric prefixes and unit abbreviations helps you read measurements accurately. The prefix micro denotes 10^-6, so a micrometer is one millionth of a meter. The common symbol is μm, but in some plain-text contexts you might see it written as mcm. That’s why mcm is used to represent a micrometer here. Nanometers are written as nm (10^-9 meters), and millimeters as mm (10^-3 meters), so micrometer sits between those two in size. Therefore, the abbreviation mcm corresponds to the micrometer.