Answer:
Unit for measuring small objects.
To measure small objects like microchip, the best unit to use is millimeter (mm) letter A.
Step-by-step explanation:
If an object is smaller than a centimeter or cm it is best to describe its measurement (size) in millimeter.
Also, millimeter is commonly used unit of measurement in metric system for measuring a small object. A millimeter (abbreviated as mm and sometimes spelled as millimetre) is a small unit of displacement like, length, distance, and size (of small objects) in the metric system. The metric system, sometimes considered synonymous with the SI units of the International System of Units, and it is used throughout the world in the sciences and is the standard of measurement for Science, Engineering and Technology, and for Mathematics.
Fun fact:
Ten millimeter is equivalent to 1 centimeter, or cm.
And a millimeter is one-thousandth of a meter.
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