2. The International System of Units
The international system of units also
known as SI
Developed in the late 1700’s
This is the system of measurement
used by scientists around the world.
3. The International System of Units
The system was created to let scientists
communicate even if they didn’t speak
the same language.
There are many different units of
measurement used throughout the
world.
4. Notes: SI system
SIlets scientists all over the world use
the same measurements even if they
speak different languages.
5. SI
Many of these units were based on parts of
the body such as the foot. Other units such
as inches were based on grains of barley.
These different units caused problems when
scientists from different countries tried to
work together.
Other problems occurred with units based on
things that could change size like a foot.
6. About SI
SI is a base 10 system
This means that each unit of measurement is
based on multiples of 10.
This makes conversion between units easy
It also eliminates fractions like in American
standard, and uses decimals instead.
7. Notes: SI Units of Measurement
The SI unit of length is meters
The SI unit of mass is kilograms
The SI unit of volume is liters
The SI unit of temperature is Kelvin or
Celsius
8. SI Units of Measurement
SI units for length
Meter (m)
Kilometer (km) 1km = 1,000m
Decimeter (dm) 1dm = 0.1m
Centimeter (cm) 1cm = 0.01m
Millimeter (mm) 1mm = 0.001m 1
9. SI Units of Measurement
SI unit of volume
Cubic meter (m³)
cubic centimeter (cm³)
Liter (L)
Milliliter (mL)
10. SI units of measurement
SI unit of temperature
Kelvin(K) 0°C = 273K
Celsius (°C ) 100 °C =373K
11. SI unit of Mass
Kilogram (kg)- equal to 1,000 grams.
Gram (g)- basic unit of mass
Milligram(mg)- one thousandth of a
gram,
12. Temperature
Temperature, measures the average
heat, or energy of motion, in the
molecules of an object.
The SI units of measure for temperature
is Celsius (C) and Kelvin (K)
The standard unit is Fahrenheit
13. Temperature
Thefreezing and boiling points of
water are the benchmarks for Celsius
and Fahrenheit .
Freezing
for C is 0° and boiling
temperature is 100°.
This
is why the Celsius scale is also
known as the Centigrade scale.
14. Temperature
Kelvin uses a different benchmark.
Thelowest temperature on the Kelvin
scale is absolute zero.
This
is the point at which all motion in
molecules stop.
15. Common uses of SI
Area: is the size of the surface of an object.
You find it by multiplying length x width l
xw
Mass, is the amount of matter in an object.
You find it by using scales.
Volume, is the amount of space an object
takes up, it is 3 dimensional. You find it by
multiplying length x width x height, (l x w x h)
16. Density
Density, is the amount of matter in an
object in a given volume. Density =
mass divided by volume or D= m
v
