Presentation on theme: "Volume and Density in the SI System why things float or sink…metrically Unit 1 – Lecture 4."— Presentation transcript:
1 Volume and Density in the SI System why things float or sink…metricallyUnit 1 – Lecture 4
2 Metric Density and Water Metric Density and WaterThe SI system is better than the English/Imperial system at converting length measurements to volume measurements.Density of Water = 1 g / cm3 [same as 1 g / 1 mL]1 gram of waterat 4 Chaving a volume of 1 cm3 [one cm3 = one mL]
3 Common SI Volume Conversions Common SI Volume Conversions1cm3 = 1mL1,000cm3 = 1,000mL1L = 1,000mL1,000mL = 1L = 1,000cm3
4 Density FormulaKnowing the volume, mass, and/or density of a substance will allow you to infer as to the missing quantity.Density = mass d = mvolume vMass = Density * VolumeVolume = Mass / Density
5 Some Common Densities in g/cm3 Some Common Densities in g/cm3AirTitanium4.5Wood – Cherry0.433Iron7.86Gasoline0.721Steel8.03Water – ICE0.897Brass8.553Mineral Oil0.914Copper8.9Paper0.929Silver10.5Water - 4C1.000Lead11.37Glass2.6Uranium18.74Aluminium2.643Gold19.32Sapphire3.99Platinum21.3Iridium, a rare metal found in asteroids, comets, and meteorites has the highest natural density at g/cm3.
6 Will it float?When any two substances are mixed, the less dense substance will float on the more dene substancedensity differences cause convection
7 ConvectionConvection – circular currents or movements within a liquid or gas due to density differences of temperaturefor the same liquid:warmer = less denserisescooler = more densesinks
8 Practice Problem #1A gold-colored ring has a mass of 18.9 grams and a volume of 1.12 mL. Is the ring pure gold? Pure gold is 19.3 g/mLgoing from g/mL g/mL…no conversion neededd = m/v18.9 g = __?__1.12 mL mLThis sample has a density of g/mL; so no, it is not pure gold
9 Practice Problem #2If the density of air = 1.30 g/L, how many grams of mass does a mL volume of air have?convert L mL250.0 mL = Ld = m / v1.30g = massL Lmass = .325 g
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