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Overview of Metric SystemPowerPoint Presentation

Overview of Metric System

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Overview of Metric System

- System of measure used by scientists around the world
- Uses prefixes and suffixes
- Suffixes
- Meter – tells us we are measuring distance, L,W,H
- Liter – tells us we are measuring liquid volume
- Gram – tells us we are measuring mass
Prefixes

Kilo = 1000

Hecto = 100

Deka = 10

Deci = 1/10

Centi = 1/ 100

Milli = 1 / 1000

- Suffixes

Distance

- Measures length, width, and height
- Distance is measured in centimeters (cm) and millimeters
(mm)

- Meter sticks and rulers are tools used for measuring distance
- 10 mm equal 1 cm. This allows to quickly change from mm to cm and back.
- To move from mm to cm, move decimal one place left.
- Example – 10.0 mm = 1.0 cm

- To move from cm to mm, move decimal one place right
- Example – 1.0 cm = 10.0 mm

Volume

- Volume measures how much space something occupies
- There are three types of volume:
- Volume of a liquid – (ml)
- Volume of solids – (cm cubed)
- Volume of a straight sided solids
- Volume of an irregularly shaped solids

Liquid Volume

- Measures how much space a liquid occupies
- Liquid volume is measured in milliliters (ml)
- Graduated cylinders and beakers are tools used to measure liquid volume
- Graduated cylinders are graduated or marked so that we can measure liquid volume
- The top of a liquid in a graduated cylinder will bend slightly. This is called a Meniscus Line. Always read a meniscus line from its lowest point

Volume of Straight Sided Solids

- Measures how much space a straight sided object takes up
- Equation to find volume:
- Length x Width x Height
- Volume of solid object is always cubed
- Volume of the cube below equals: 5 x 5 x 5 = 125 cm cubed

Volume of irregularly shaped solids

- Displacement Volume
- Found by submerging the object in water.
- The amount of water that is moved, or displaced, tells us the volume of the object

- A graduated cylinder or beaker is required
- Equation is:
- Final Water Level - Initial Water Level = Volume of object in ml
- Convert ml to cm cubed: 1 ml = 1 cm cubed

Mass

- Measures how much something weighs
- Mass is measured in grams
- Electronic scales are a tool used to measure mass

Density

- Defined as the amount of mass in a given volume.
- Equation to find density is mass / volume.

Perimeter, Area, Volume

- P = S + S + S + S
- (add all sides of object)
- P = 5 + 5 + 5 + 5 = 20 cm

- A = S x S
- (always squared)
- A = 5 x 5 = 25 cm squared

- V = Length X Width X Height
- (volume is always cubed for solids)
- V = 5 x 5 x 5 = 125 cm cubed

Metric Ladder

Prefixes can be used with all three measuring base words: meter (distance), liter (liquid volume), gram (mass). Base words are found in the middle of the metric ladder.

Example: kilometer, hectoliter, centigram

As you move left numbers get larger, as you move right numbers get smaller

Metric Conversions

- Use the metric ladder as your guide
- Find your starting point and your end point on the ladder
- Count the number of spaces to move from your starting point to your end point
- Decide if you moved right or left on the ladder
- Move the decimal the same number of spaces that you moved and in the direction that you moved
- Example to convert from millimeter to decimeter you would move the decimal point two places to the left
- 100 mm equals 1.00 dm

Temperature

- Measures how hot or cold something is
- Temperature is measured in degrees Celsius or degrees Fahrenheit
- Thermometers are a tool used to measure temperature

Temperature Scales

- Celsius Scale
- 0 is freezing and 100 is boiling
- Fahrenheit Scale
- 32 is freezing and 212 is boiling

Temperature Conversions

- Celsius to Fahrenheit
- F = (C x 1.8) + 32
- Fahrenheit to Celsius
- C = ( F - 32 ) / 1.8

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