Posted on 7th Nov 2010 | In Physics
S.I. stands for Systeme Internationale, which is also known as the International System of Units.
You may not notice this but we always use this as a form of measurement. SI units have been accepted around the world as an ideal replacement to other metric systems that may cause confusion and uncertainty among people. Today, people from all countries follow this metric system, and that includes me and you!
A long time ago, people from different countries had different ways of measuring things, which made it harder for them to trade. People need to measure what they buy and exchange for them to prosper, but not having a common and correct way of measuring was a problem. Finally, scientists came up with a unit of measurement that can replace all other existing ways we measure objects. This is how the SI unit of measurement came about.
Using the SI unit of measurement helped everyone understand and communicate well doing business. People realized how practical it was to use only one measurement system for every kind of unit. They can now use one unit to measure the weight of a sack of potatoes and a slab of meat, and made it easier to compare their value. It became so useful that everybody started to use SI units because it allowed them to compute in an accurate and simple manner.
Scientists decided to set this system of measurement to measure nearly everything that’s valuable and important. From the seven basic units of S.I., we can now compute for mass, length, time, temperature, amount or quantity of a substance in matter, brightness of an object or luminous intensity and the flow of electric currents. Even if we use other forms of measurement, we can easily convert these into SI units by following the conversion table.
S.I. units are so precise that these are used in all scientific measurements. There are seven basic units, and then we add prefixes for sub-units. Each sub-unit originates from the base unit, so it’s easier to identify the type of measurement used (for example, adding the prefix centi to the basic unit meter = centimeter, which is one hundredth of a meter). Listed below are the seven SI basic units of measurement.
Because using SI units allow us to measure objects or matter in a more simple, straightforward and yet accurate manner, calculating is effortless for everyone. Using an exact way to measure things is way better, and of course easier and more reliable than using your arms or legs to explain the distance between two points.
Isn’t it fun to learn about SI units? Now you can easily compare one object with another by using the SI unit for mass (kilogram), or know how far it is to go to a certain place just by using the SI unit for length or distance (meter).
Want to learn more about the SI Units? Check out the free previews from The King Activity Set! You can also download our free worksheet and coloring page all about SI Units!
Elva O'Sullivan Ph.D is an educator and founder of ScienceWithMe.com She has created over 50 educational science products for the marketplace. To learn more about her and ScienceWithMe!® follow her on Facebook, LinkedIn and Twitter.
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