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MEASUREMENTSCIENCE
Center Grove Middle School North
Earliest System Of Measurements & Weights
Genesis 6:15 " The length of the Ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits."
Span Foot
Bronze Age 3000 BC- 2500BC, people of Indus Valley , Egypt and Mesopotamia.
Indus Valley
Why do we need a uniform system of measurement?
Timeline of countries that changed over to the SI units of measurement.
Identify the three countries that have not changed to this system.
USA, Liberia, & Burma
Measurement
Describe the world using numbers Types of Measurement include:
Distance, time, speed, volume, mass…
Measurement can also help describe events
Metric System
Called the International System of Units or SI Decimal system based on 10’s
Prefixes include:Milli (1/1000th)Deci (1/10th)Kilo (1000)
Metric System
Used by scientists all over the world to measure length, volume, mass, weight, density, and temperature.
King Hector Doesn’t Usually Drink Chocolate Milk
KILO HECTO DEKA UNIT DECI CENTI MILLI
Precision and Accuracy
Precision is the closeness of repeated measurements to each other.
Accuracy is the closeness of a measured or derived data value to its true value.precise = repeatable
accurate = true
Discovery Video Clip
Precision and Accuracy
Significant digits are necessary when calculating DON’T COUNT Zeros at the end of the number
without a decimal (ex. 1300) OR Zeros at the beginning of a decimal (ex. 0.0025). Video Clip
When adding or subtracting, use the smallest number of decimal places.
Example: 4.587
+ 3.1
7.687Answer in significant digits = 7.7
Decimal places = 3
Decimal places = 1
Precision and Accuracy
Scientific notation is used so large numbers are easier to understand. Move the decimal point until only 1 nonzero
number remains on the left. Count the number of places you moved the decimal and use that number as a power of ten
Examples: 85670000000 = 8.567 x 1010
0.00000045 = 4.5 x 10-7
43289 = 4.3289 x 104
Length
Distance from one point to another METER (M) is the basic unit
1M = 100cm 1M = 1000mm 1km = 1000M
Volume
Amount of space an object takes up Liter (L) is the basic unit of LIQUID volume Cubic centimeter (cm3) is the basic unit of
SOLID volume
Mass
Amount of matter in an object Gram (g) is the basic unit
Weight
Amount of attraction between two objects due to gravity
Newton (N) is the basic unit MASS AND WEIGHT ARE NOT THE SAME!
Density
Mass per unit volume of a substance g/mL is the basic unit Formula: Density = Mass divided by Volume
Density = g/mL Density of water is 1gram/milliliter If an object’s density is less then one it will float. If an object’s density is greater then one it will
sink.
Temperature
Measure of hotness and coldness Celsius (C°) is the basic unit Water freezes at 0° degree Celsius and boils at
100° degrees Celsius.