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## PowerPoint Slideshow about ' MEASUREMENT' - ovidio

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Presentation Transcript

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)

- Prefixes include:

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 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 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 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/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

- 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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