Measurement

SI Units  Scientists use the same international system for measurement called SI units  Short for Systeme Internationale d’Unites (French)  Helps scientists compare research from around the world  Built on 7 metric base units

SI Units  The Big 5 MeasurementUnit LengthMeters (m) MassKilograms (kg) TimeSeconds (s) AmountMoles (mol) TemperatureKelvin (K)

Metric Prefixes  Metric prefixes are made to make base units larger or smaller  REMEMBER: King Henry Died By Drinking Chocolate Milk PrefixUnit Abbreviation Meaning (__ plug in a base unit of g, L, or m) Kilok1000 __ = 1 k__ (i.e m = 1 km) Hectoh100 __ = 1 h__ Decada10 ___ = 1 da___ Base (No Prefix)g or L or mBase unit Decid1 ___ = 10 d ___ Centic1 ___ = 100 c ___ MilliM1 ___ = 1000 m ___

Temperature Conversions  Temperature Scales  Fahrenheit (°F)  Daily temp… not scientific  Celsius (°C)  Freezing point of water = 0°C  Boiling point of water = 100°C  Kelvin (K)  SI unit of Temperature  Absolute Zero  0 K  When all motion stops  We have gotten to a millionth of a degree but never 0 K

Temperature Conversions  1 °C = 1 K  Changing FROM °C  K °C = K  Changing FROM Kelvin  °C K-273 = °C

Convert the Following…  25 ° C = ______ K  123 ° C = _______ K  853 K = _______ ° C  K = _______ °C  0 °C = _____ K  0 K = ______ °C

Density  Density – ratio of mass of an object to its volume  Density = Mass Volume  The density of water = 1.0 g/mL  If density is > 1, object will sink  If density is < 1, object will float Mass VolumeDensity Common Units: Mass: g, kg, lbs Volume: L, mL, gal., qt., cm 3 Density: g/mL; lbs/gal; g/cm 3