Prefixes used in the metric system: a. What prefix do you use to signify one-thousand metric units? b. What prefix do you use to signify one million metric units? c. What prefix do you use to signify one-tenth of a metric unit?

The elegance of the metric system lies in its logical, base-10 structure, which uses prefixes to scale standard units like the meter or gram. These prefixes often derive from Greek for large quantities and Latin for small ones. "Kilo," for example, comes from the Greek word *khilioi*, meaning "thousand." This is why a kilometer is exactly one thousand meters. For an even larger scale, "mega" is drawn from the Greek *megas*, meaning "great," and was adopted to signify a factor of one million. You might see this in a megawatt, which is one million watts of power.

On the other side of the decimal point, Latin roots come into play. The prefix "deci" originates from the Latin word *decimus*, meaning "tenth." Therefore, a deciliter is simply one-tenth of a liter. This system of prefixes was established during the French Revolution to replace a chaotic array of local measurements with a rational, universal standard. Its simplicity and scalability are why it became the foundation (Review) of the International System of Units (SI), used in science, medicine, and commerce around the globe.