1. 8th Science Metric Measurement

2. International System of Units
Abbreviated SI
Uses 10 as base unit
SI Prefixes
kilo hecto deca unit deci centi milli
Larger  smaller
(Unit – meter, liter, or gram)

3. Prefix staircase Kilo hecto deca unit meter deci liter centi
gram milli

4. Length SI standard unit is meter (m)
Measure with metric ruler or meter stick
Know: 1 meter = 100 cm
1 cm = 10 mm
1 km = 1000 meters
If measure desk use what? Why?

5. Mass Measure of amount of matter in object
Depends on number & kind of atoms in object.
Standard unit is gram.
Use balance to measure
mass.
Mass stays the same no matter where it is measured.

7. Weight
Measure of gravitational force which is attraction between objects
2 factors affect weight:
1) mass of objects
2) distance between objects
Standard SI unit is Newton.
Use spring scale to measure weight.
Changes from place to place if gravity is different

8. Volume Measure of how much space an object occupies
Volume of regular solid
volume of rectangle= length x width x height
V = 2m x 4m x 3m
V = 24 m 3

9. Use graduated cylinder Unit is liter (L) or milliliter (mL)
Volume of liquid
Use graduated cylinder
Unit is liter (L) or
milliliter (mL)
1 mL = 1 cm
Jar of rocks & cotton balls
Which has a greater volume?
same
What is different?
mass & weight 3

10. Volume of an uneven object (ex. Rock) * Use water displacement
1) Fill graduated cylinder so object will be covered ( 30 to 50 mL)
2) Gently drop object into cylinder.
3) Read new volume
4) Subtract (new volume – old volume)

11. Temperature Measure of how hot or cold SI unit is Kelvin
absolute zero = 0 K
Most scientists use Celsius
0 C = freezing point of water
100 C = boiling point of water
Celsius = Kelvin
Do sheet on thermometer o o o o

12. Density Measure of amount of matter that occupies a particular space.
Formula: Density = mass/volume
Problem 1: The mass of a cubic piece of metal is 80 g & its sides measure 2 cm. What is its density?
mass = 80g Volume= 2cm x 2cm x 2cm
= 8 cm
density = 80g = 10 g/cm
8 cm 3 3 3

13. Problem 2: The mass of a container and pop is 700g
Problem 2: The mass of a container and pop is 700g. The container by itself has a mass of 100g. The volume of pop is 200mL. What is its density?
mass of pop = 700g – 100g
= 600g
volume = 200mL
Density = 600g = 3g/mL
200mL
Demo liquid density