1. 6th and 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. (add weight from three slides)
Mass stays the same no matter where it is measured.

7. Weight Measure of gravitational force: 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. 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 thermometer section on homework o o o o

9. 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
6th Grade - Do the Math page 10 - now You Try It! (page 11)

10. Volume of a Liquid Measured with 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

11. Volume of an irregular object (like a 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)
*Object must have density greater than 1 (density of water). If density is less than 1, the object will float.
Density? What’s that…….?!?!?

12. Density Mass 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
Density
Volume 3 3 3

13. 6th grade - Formula: Density = mass/volume
Problem 2: Pumice is an igneous volcanic rock, formed by the rapid cooling of lava. What is the density of a 49.8g piece of pumice that has a volume of 83cm ?
Identify
What do you know?
What do you want to find?
Plan
Write the formula
Substitute the given values into the formula
Solve
Divide
Check that your units agree now You Try It! (page 14) 3

14. 6th grade -
Problem 3 (p. 15) – A basalt rock displaces 16 mL of water. The density of the rock is 3.0 g/cm . What is the mass of the rock?
Identify
What do you know?
What do you want to find?
Plan
Write the formula
Substitute the given values into the formula
Solve
Divide
Check that your units agree
now You Try It! (page 15) 3

15. 8th Grade -
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

16. 8th grade -
Problem 3 – A basalt rock displaces 16 mL of water. The density of the rock is 3.0 g/cm . What is the mass of the rock?

17. Density Column
A substance that is less dense will float on a substance that is more dense.
What is the color of the least dense liquid?
The density of water = 1