Overview of Metric System

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# Overview of Metric System - PowerPoint PPT Presentation

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

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Presentation Transcript
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

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

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
• 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