International System of Units

High school (ages 12+)
Mathematics & Numbers

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/international-system-of-units

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the system name?International System of Units (SI)
2. What is the base units?7 (Second, Meter, Kilogram, Ampere, Kelvin, Mole, Candela)
3. How is the meter defined in the SI system?The meter is defined by the distance light travels in a vacuum in 1/299,792,458 of a second, using the speed of light.
4. Why do we use prefixes like kilo- and milli- in SI units?Prefixes let us easily express very large or very small numbers, like a kilometer (1000 meters) or a milligram (0.001 grams), without changing the base unit.

Coherent System: A system where derived units are formed by simple multiplication or division of base units without numerical factors.
Fundamental Constants: Physical constants (like the speed of light) that are believed to be the same everywhere in the universe and unchanging.
Metrology: The scientific study of measurement and its applications.