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The International System of Units and The Metric System. The International System of Units. Also known as SI units It is the modern day metric system It is a form of measurement used all around the world. When was SI created?.
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The International System of Units • Also known as SI units • It is the modern day metric system • It is a form of measurement used all around the world
When was SI created? • The system of measurement was created in 1960 after the General Conference on Weights and Measures asked the International Committee for Weights and Measures to conduct a study on international measurements. • In 1954, they created six base units: • Meter, kilogram, second, ampere, Kelvin, and candela
When was SI created? (cont.) • In 1960, they created the name International System of Units, abbreviated SI, from the French name: Le Systeme international d’unites. • They added ONE more SI unit (mole) in 1971
The Metric System • A system of measurement based on the number “10” • Records show it was used in the mid 1500’s • Used ALL over the world as the main system of measurement, EXCEPT in these countries: • Liberia • Burma • The United States
Length • Definition- the distance from one point to another • Basic SI Unit- meter (m) • Tools to measure length- • metric ruler (centimeters) • Meter stick (100 centimeters)
Mass • Definition- the measure of the amount of matter in an object. • Basic SI Unit- kilogram (k) • Tools to measure mass: • Scale • Triple Balance Beam
Difference between Mass and Weight • Mass- the amount of matter in an object • Weight- a measure of the force of gravity acting on an object. It is measured using a scale. • You mass is the same, no matter where you go. Your weight changes due to gravity. • Ex: You weigh 100 lbs on Earth. If you went to the moon, you would weigh 16.6 lbs.
Volume • Definition- the amount of space an object takes up. • Basic SI Unit- Liter (L) • Tools to Measure Volume: • Volume of a Liquid- graduated cylinder (L) • Volume of Rectangular Solids- • Length x Width x Height (cm3) • Volume of Irregular Solids- Water displacement
Density • Definition- a measure of how much mass is contained in a given volume. • Units- • g/cm3 or g/mL • Calculate- • Density= Mass/ Volume
Time • Definition- • Basic SI Units- second (s) • Tools for measure time- • Clocks • Watches
Temperature • Definition- How warm or cold something is • Basic Units of SI- Kelvin (K) • Scientists use Celsius (C) • Tools to Measure Temperature- • Thermometer
Conversion between Units • How do you convert Meters to Centimeters? • Write down the number you want to convert and its proper unit. Ex: 100 meters = ? cm • If the number is a whole number, add the decimal point at the end of the number. Ex: 100. meters • Using the conversion chart, move the decimal point towards the proper unit.