Dimensional Analysis A scary sounding name for something that is pretty darn easy.

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Presentation transcript:

Dimensional Analysis A scary sounding name for something that is pretty darn easy.

Why it’s important to include your UNITS Units are essential to understanding data. A unit gives definition to a numerical value. 100 = number. 100 what? – The number alone does not tell us much. 100 kg is a quantity. –The unit gives us more information.

Scientists speak METRIC! - When scientists measure anything they use the metric system. - 3 basic units are: Mass = Gram Volume = Liter or m 3 Length = Meter

Just add a PREFIX (Language Arts in Science, Crazy!!) The basic units can be further defined by adding a prefix. The main units we will use are: Kilo = 1000 Centi = 1/100 Milli = 1/1000

Tools for Measure Mass= Scale Volume= Meter stick Ruler Graduated cylinder (displacement) Length= Meter stick Ruler

Converting Units Dimensional Analysis a.k.a. Factor Labeling We use proportions to convert from one unit to another. Some rules to remember: –Carry your units through the entire problem. Don’t lose them. –Use what you know or info that you are given (pg. 6- “Tools of a Scientist” binder packet).

Example Problem: How many centimeters in 2 meters? We know how many meters. We want to know how many centimeters that is. Known fact: 1 m = 100 cm Turn what you know into a ratio 2m 1m 100cm= 200cm X

Let’s Practice. Work with a partner, then check with your table 1.How many grams in 5 kg? 2.How many centimeters in 6km? 3.How many millimeters in 1.5cm? 4.How many milliliters in 2.3 L? 5.How many meters in 16.4 km? 6.How many liters is 460 ml?