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MEASUREMENT Mr. Peterson SCIENCE Center Grove Middle School North

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Measurement Describe the world using numbers Types of Measurement include: Distance, time, speed, volume, mass… Measurement can also help describe events

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Metric System Called the International System of Units or SI Decimal system based on 10’s Prefixes include: Milli (1/1000 th ) Deci (1/10 th ) Kilo (1000)

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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 KILOHECTODEKAUNITDECICENTIMILLI

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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 Practice

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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). When adding or subtracting, use the smallest number you use. Example: 4.587 +3.1 7.687 Answer in significant digits = 7.7 significant digits = 4 significant digits = 2

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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 10 10 0.00000045 = 4.5 x 10 -7 43289 = 4.3289 x 10 4

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Length Distance from one point to another METER (M) is the basic unit 1M = 100cm 1M = 1000mm 1km = 1000M

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Volume Amount of space an object takes up Liter (L) is the basic unit of LIQUID volume Cubic centimeter (cm 3 ) is the basic unit of SOLID volume

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Mass Amount of matter in an object Gram (g) is the basic unit

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Weight Amount of attraction between two objects due to gravity Newton (N) is the basic unit MASS AND WEIGHT ARE NOT THE SAME!

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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.

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Temperature Measure of hotness and coldness Celsius (C°) is the basic unit Water freezes at 0° degree Celsius and boils at 100° degrees Celsius.

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