Standards of MeasurementStandards of Measurement

Section 1.2Section 1.2

MeasurementMeasurement

Standard- exact quantity people agree to Standard- exact quantity people agree to use for comparisonuse for comparison

Unit- description of what standard was Unit- description of what standard was usedused

SI system- international system of unitsSI system- international system of unitsAllows easy communication between Allows easy communication between

scientistsscientistsg, m, L, s, A, K, mol - base units- unit by itselfg, m, L, s, A, K, mol - base units- unit by itself

Metric PrefixesMetric Prefixes

Giga- 1,000,000,000Giga- 1,000,000,000 GG Mega-Mega- 1,000,0001,000,000 MM Kilo- 1,000Kilo- 1,000 kk Hecto- 100Hecto- 100 hh Deca – 10Deca – 10 dada Base UnitBase Unit Deci- 0.1Deci- 0.1 dd Centi- 0.01Centi- 0.01 cc Milli- 0.001Milli- 0.001 mm Micro- 0.000001Micro- 0.000001 μμ

Metric ConversionsMetric Conversions

Conversion factor- ratio equal to 1 that can Conversion factor- ratio equal to 1 that can be used to convert between unitsbe used to convert between units

Volume- space occupied by an objectVolume- space occupied by an objectMass- amount of matter in an objectMass- amount of matter in an objectDensity- mass per unit volume- reason Density- mass per unit volume- reason

same volume may have different masssame volume may have different massDerived unit- combinations of base unitsDerived unit- combinations of base unitsg/mlg/ml

TemperatureTemperature

Temperature- measure of average KE of Temperature- measure of average KE of moleculesmoleculesCelsiusCelsiusFahrenheitFahrenheitKelvinKelvin

0 K = -273.150 K = -273.15ooCC K = K = ooC + 273.15C + 273.15ooC = K -273.15C = K -273.15