1. The Metric System l International System of Units l Systeme International (SI) l National Bureau of Standards (old) l National Institute of Standards and Technology (new)

2. The Metric System l Base Units of the International System QuantityName of UnitUnit Symbol lengthmeterm masskilogramkg timeseconds temperature kelvinK amount of substance molemol electric current ampereA luminous intensity candelacd

3. The Metric System l Prefixes of the International System FactorPrefix Symbol 10 9 giga G 10 6 mega M 10 3 kilo k 10 2 hectoh 10 1 deka da

4. The Metric System l Prefixes of the International System FactorPrefix Symbol 10 -15 femtof 10 -12 picop 10 -9 nanon 10 -6 micro  10 -3 millim 10 -2 centic 10 -1 decid

5. The Metric System l Conversions Between the English System & the Metric System Conversion Factor inches to centimeters1 inch = 2.54 cm feet to meters3.28 feet = 1 meter grams to pounds 453.6 grams = 1 pound quarts to liters 1 quart = 0.946358 Liter

6. The Metric System l Temperatures Three Basic Scales for measuring temperature Fahrenheit fp water = 32ºF bp water = 212ºF Celsius (Centigrade) fp water = 0ºC bp water = 100ºC Kelvin fp water = 273K bp water = 373K

7. The Metric System l Temperature Conversions l Fahrenheit/Celsius l Celsius/Kelvin K = ºC + 273

8. The Metric System Application Question l What is the Kelvin temperature at which both the Celsius and Fahrenheit temperature are the same?

9. The Metric System l If C = F, then let x=C and x=F. Rewrite the above expression as: l l Solve by first cross multiplying: l 9 x = 5(x-32) l 9 x = 5x – 160 l 4 x = - 160 l x = - 40 l This is the temperature at which both Celsius and Fahrenheit are the same. l Since K =  C + 273, K = -40 + 273