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## Measurement

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**SI Units**• Scientists use the same international system for measurement called SI units • Short for SystemeInternationaled’Unites (French) • Helps scientists compare research from around the world • Built on 7 metric base units**SI Units**• The Big 5**Metric Prefixes**• Metric prefixes are made to make base units larger or smaller • REMEMBER: King Henry Died By Drinking Chocolate Milk**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 + 273 = K • Changing FROM Kelvin °C K-273 = °C**Convert the Following…**298 • 25 ° C = ______ K • 123 ° C = _______ K • 853 K = _______ ° C • 87.89 K = _______ °C • 0 °C = _____ K • 0 K = ______ °C 396 580 -185.11 273 -273**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 Density Volume Common Units: Mass: g, kg, lbs Volume: L, mL, gal., qt., cm3 Density: g/mL; lbs/gal; g/cm3