Illinois Field Crop Applicators Practice Test

Which unit of measurement indicates there are 1/25,000 of an inch in size?

1. Millimeters

2. Microns

3. Centimeters

4. Nanometers

The correct answer is: Microns

The correct answer is microns. A micron, also known as a micrometer, is a unit of measurement that is equal to one-millionth of a meter or one-thousandth of a millimeter. When we relate this measurement to inches, it equates to approximately 1/25,000 of an inch in size. This small measurement is often used in various fields, including biology and materials science, to measure things like the size of cells, bacteria, and particles. In contrast, millimeters and centimeters are larger units of measurement that do not represent such tiny fractions of an inch. A millimeter is 1/1,000 of a meter, which translates to about 1/39.37 of an inch, and a centimeter is 1/100 of a meter or about 1/2.54 of an inch. Nanometers, meanwhile, are even smaller than microns, measuring one-billionth of a meter, but they do not correspond to the 1/25,000 of an inch specified in the question.