Standards of Measurement

Section 1.2

Measurement

 Standard- exact quantity people agree to use for comparison  Unit- description of what standard was used  SI system- international system of units  Allows easy communication between scientists  g, m, L, s, A, K, mol - base units- unit by itself

Metric Prefixes

 Giga- 1,000,000,000  Mega 1,000,000  Kilo- 1,000   Hecto- 100 Deca – 10  Base Unit  Deci- 0.1

 Centi- 0.01

 Milli- 0.001

 Micro- 0.000001

d c m μ G M k h da

Metric Conversions

 Conversion factor- ratio equal to 1 that can be used to convert between units  Volume- space occupied by an object  Mass- amount of matter in an object  Density- mass per unit volume- reason same volume may have different mass  Derived unit- combinations of base units  g/ml

Temperature

 Temperature- measure of average KE of molecules  Celsius  Fahrenheit  Kelvin  0 K = -273.15

o C  K = o C + 273.15

 o C = K -273.15