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MEASUREMENT

MEASUREMENT. Mr. Peterson SCIENCE Center Grove Middle School North. Measurement. Describe the world using numbers Types of Measurement include: Distance, time, speed, volume, mass… Measurement can also help describe events. Metric System.

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MEASUREMENT

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  1. MEASUREMENT Mr. Peterson SCIENCE Center Grove Middle School North

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

  3. 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)

  4. 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

  5. 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

  6. 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 significant digits = 4 significant digits = 2 Answer in significant digits = 7.7

  7. 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

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

  9. 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

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

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

  12. Density • Mass per unit volume of a substance • g/mLis 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.

  13. 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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