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# MEASUREMENT - PowerPoint PPT Presentation

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

Mr. Peterson

SCIENCE

Center Grove Middle School North

• Describe the world using numbers

• Types of Measurement include:

• Distance, time, speed, volume, mass…

• Measurement can also help describe events

• Called the International System of Units or SI

• Decimal system based on 10’s

• Prefixes include:

• Milli (1/1000th)

• Deci (1/10th)

• Kilo (1000)

• 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 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

• 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

• 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

• Distance from one point to another

• METER (M) is the basic unit

• 1M = 100cm

• 1M = 1000mm

• 1km = 1000M

• 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

• Amount of matter in an object

• Gram (g) is the basic unit

• Amount of attraction between two objects due to gravity

• Newton (N) is the basic unit

• MASS AND WEIGHT ARE NOT THE SAME!

• 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.

• Measure of hotness and coldness

• Celsius (C°) is the basic unit

• Water freezes at 0° degree Celsius and boils at 100° degrees Celsius.