1. Standards of Measurement

2. Units and Standards
A standard is an exact quantity that people agree to use for comparison
If different measurements are made using the same standard we can compare them

3. Le Systeme Internationale d’Unites
The International System of Units was developed in 1960
We now call this the SI system for short
SI is a set of standards that are universally accepted and used by scientists around the world

4. Measurement Systems
What is the purpose of a standard?

5. Measurement Systems The SI system is based on multiples of 10
Prefixes are used to show which multiple of 10 is being used
Prefix
Symbol
Multiplying Factor
Kilo- k
1,000
Deci- d
0.1
Centi- c
0.01
Milli- m
0.001
Micro-
Nano- n

6. What will we be measuring?
Length
Volume
Density
Time
Temperature

7. Length We use length to measure size and distance
Meter, centimeter, kilometer

8. Volume Volume is the amount of space occupied by an object 1ml = 1cm3
Liters, milliliters

9. Matter Matter is anything that takes up space
Mass is a measurement of the quantity of matter in an object
Grams, kilograms

10. Density Density is the mass per unit of volume of an object g/cm3
How much matter is in a given space
g/cm3

11. Time The SI unit for time is the Second (s) 60 s = 1 min
3,600 s = 60 min = 1 hr

12. Temperature The SI unit for temperature is the kelvin (K)
Zero on the kelvin scale (0 K) is the coldest possible temperature – absolute zero
0 K = -273 ºC
273 ºC below the freezing point of water!!! COLD!

13. Freezing point of Water
Temperature
The kelvin scale is based on absolute zero (-273 ºC)
Kelvin
Celsius
Fahrenheit
Freezing point of Water
273 K
0 ºC
32 ºF
Boiling point of
Water
373 K
100 ºC
212 ºF

14. Converting SI units How do we convert between units?
You have a length of rope that measures 3,075mm. How long is it in centimeters?
Your drive to school is 12.4km. How far is it in meters?

15. (Write neatly!! This one can be tricky if you lose your place!)
Converting SI units
The speed limit on the Northway is 65mph. Convert 65mph to km/h.
1 mile = 1.61km
Once you have calculated km/h, convert your answer to m/s.
(Write neatly!! This one can be tricky if you lose your place!)