MEASUREMENTMr. Peterson

SCIENCECenter 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 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 = repeatableaccurate = true

Practice

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

7.687Answer in significant digits = 7.7

significant digits = 4

significant digits = 2

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.