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__**Converting Between Units:Pgs. 84 to 87**__ Multistep Problems Like cleaning a car: first you vacuum the inside, then wash the outside, then wax it 3 steps: Practice Problem: The radius of a potassium atom is .2227 nm. Express this radius in the unit centimeters. Converting Complex Units Many common measurements are expressed as a ratio of two units: kilometers per hour, miles per gallon Can use dimensional analysis, it will simply take some extra steps 2 units left after canceling instead of 1 Practice Problem:Gold has a density of 19.3 g/cm 3. What is the density in kilograms per cubic meter?
 * Analyze: List knowns and unknowns
 * Calculate: Solve for unknowns, dimensional analysis
 * Evaluate: Does the result make sense?