Science Numbers Review

1
Science Numbers Review

• Metric System

2
Metric System Introduction

• Aka System International (SI units)
• Based on powers of ten
• Language of science

3
Length

• Length is the distance between two points
• The SI base unit is meter (m)
• Measure length with meter sticks

4
Mass

• Mass is the amount of matter that an object takes
  up
• The SI unit for mass is gram (g)
• Mass versus Weight
• - mass (amount of matter) is constant
• - weight (force of gravity) is not constant
• Measure mass with scales and triple beam balances

5
Volume

• Volume is the amount of space in an object
• SI unit for solids is cubiccm3 or liquids is
  liter
• Volume of a box L X W X H

Ex. Length 4cm Width 2cm Height
2cm What is the volume?
6
Water Displacement

• Use this method to find the volume of objects
  that are not boxed shape
• Place water in cylinder and watch the change in
  water level

7
Graduated Cylinders

• Volume of a liquid is found using a graduated
  cylinder
• Liquids form curved surface when poured
• To correctly read the volume, read the bottom of
  the curve called the meniscus

8
Density

• Density is the amount of matter (mass) compared
  to the amount of space (volume) the object
  occupies
• Density is mass divided by volume
• D Mass/ Volume
• For example
• - Mass is 5g
• - Volume is 10ml
• - D ??????

9
Float or sink?

• More dense an object is the more matter it has in
  it
• Less dense an object is the less matter it has in
  it

10
Temperature

• SI unit is degrees Celsius
• Measured using a thermometer

11
Review Metric Units

• -Length
• -Volume
• -Mass
• -Temperature

12
Metric Prefixes

• Regardless of the unit, the entire system uses
  same prefix
• Common prefixes are
• - kilo 1000
• - centi 1/100th
• - milli 1/1000th

13
Metric Stairs for Conversions
14
Metric Practice

1. 54.2 cm ____________m
2. 132.6cl _____________ Hl
3. 8.2 kg _____________g
4. 45.23g _____________ mg

15
Metric Practice

1. 54.2 cm .542 m
2. 132.6cl .01326 Hl
3. 8.2 kg 8200 g
4. 45.23g 45230 mg

16
Graphing

• Labels (title, x axis, y axis, units)
• Smooth lines connect the dots
• Accuracy
• Dependent Variable on the y axis
• Independent Variable on the x axis