the international system of units also known as si units it is the modern day metric system it is a...
TRANSCRIPT
The International System of UnitsAlso known as SI unitsIt is the modern day metric systemIt 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
SI units, Symbols and QuantityName Symbol Quantity
Meter m Length
Kilogram kg Mass
Second s Time
Ampere A Electric Current
Kelvin K Thermodynamic temperature
Mole mol Amount of substance
Candela cd Luminous intensity
The Metric SystemA 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:LiberiaBurmaThe United States
PrefixesPrefix Symbol Meaning
Kilo- k 1,000
Hecto- h 100
Deka- da 10
Unit Just the unit 1
Deci- d 0.1 (one tenth)
Centi- c 0.01 (one hundredth)
Milli- m 0.001 (one thousandth)
LengthDefinition- the distance from one point to
another
Basic SI Unit- meter (m)
Tools to measure length- metric ruler (centimeters)Meter stick (100 centimeters)
MassDefinition- the measure of the amount of
matter in an object.
Basic SI Unit- kilogram (k)
Tools to measure mass:ScaleTriple 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.
VolumeDefinition- 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
DensityDefinition- a measure of how much mass is
contained in a given volume.
Units- g/cm3 or g/mL
Calculate- Density= Mass/ Volume
TimeDefinition-
Basic SI Units- second (s)
Tools for measure time-ClocksWatches
TemperatureDefinition- How warm or cold something is
Basic Units of SI- Kelvin (K)Scientists use Celsius (C)
Tools to Measure Temperature- Thermometer
Conversion between UnitsHow do you convert Meters to Centimeters?
1. Write down the number you want to convert and its proper unit. Ex: 100 meters = ? cm
2. If the number is a whole number, add the decimal point at the end of the number. Ex: 100. meters
2. Using the conversion chart, move the decimal point towards the proper unit.
Conversion Chart