Units of Measurements Objectives: -Name SI units for length, mass, time, volume, and density -Perform density calculations.

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Presentation transcript:

Units of Measurements Objectives: -Name SI units for length, mass, time, volume, and density -Perform density calculations

SI Measurements International standard of measurement Defined in terms of standards of measurement

SI Base Units QuantitySymbolBase UnitAbbrev. length l meterm mass m kilogramkg time t seconds temperature T KelvinK

Metric Prefixes Prefixes are added to the names of SI base units to represent quantities that are larger or smaller than the base units SI Prefixes PrefixScientific notationMeaning mega (M) kilo (k) hecto (h) deka (da) Base Unit deci (d) centi (c) milli (m) micro (  ) nano (n)

Derived Units Combinations of SI base units Produced by multiplying or dividing standard units Ex: ▫ Area (m 2 )  length x width ▫ Volume (m 3 or cm 3 )  length x length x length ▫ Density (kg/m 3 or g/cm 3 )  mass per volume

Volume ▫ Volume: the amount of space occupied by an object ▫ SI unit = cm 3 ▫ Volumes of liquids and gases are often measured by a non-SI unit called the liter (L)  1 L = 1000 cm 3 ▫ mL is used for smaller volumes  1000 mL = 1 L ▫ What can you tell me about the relationship between mL and cm 3 ?  1000 mL = 1L = 1000 cm 3  1 mL = 1 cm 3

Volume (cm 3 ) Mass (g)

You Try! ▫ What is the density of a block of marble that occupies 310 cm 3 and has a mass of 853 g?  2.75 g/cm 3 ▫ Diamond has a density of 3.26 g/cm 3. What is the mass of a diamond that has a volume of cm 3 ?  1.14 g ▫ What is the volume of a sample of liquid mercury that has a mass of 76.2 g, given that the density of mercury is 13.6 g/mL?  5.60 mL

Practice Problems Density 1.The mass of a sample of aluminum is 4.82 g. The same sample of aluminum occupies a volume of 3.08 mL. Determine the density of the aluminum sample. 2.A small gold nugget has a volume of 0.87 cm 3. What is its mass if the density of gold is 19.3 g/cm 3 ? 3.What volume is occupied by 35.2 g of carbon tetrachloride if its density is 1.60 g/mL? 4.A cork occupying a volume of 5.23 mL is measured to have a mass of 14.7 g. What is the density of the cork?