Measurement
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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

MEASUREMENT

Mr. Peterson

SCIENCE

Center Grove Middle School North


Measurement1

Measurement

  • Describe the world using numbers

  • Types of Measurement include:

    • Distance, time, speed, volume, mass…

  • Measurement can also help describe events


Metric system

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 system1

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


Precision and accuracy

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


Precision and accuracy1

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


Precision and accuracy2

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

Length

  • Distance from one point to another

  • METER (M) is the basic unit

    • 1M = 100cm

    • 1M = 1000mm

    • 1km = 1000M


Volume

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


Measurement

Mass

  • Amount of matter in an object

  • Gram (g) is the basic unit


Weight

Weight

  • Amount of attraction between two objects due to gravity

  • Newton (N) is the basic unit

  • MASS AND WEIGHT ARE NOT THE SAME!


Density

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.


Temperature

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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