ESS15_LEC1F10_Origin_2perpage - Introduction to...

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9/25/10 1 Introduction to Oceanography Lecture 2: Scientific notation, Earth and the origin of our oceans Magma degassing at Halemaumau Crater, Kilauea, Hawaii April 2008, Mila Zinkova, wikimedia, CC A S-A 3.0 Introduction to Oceanography 1. Attend Your Lab Section! --TA’s have PTE#’s 2. Podcasting More Halemaumau (same image credit)
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9/25/10 2 Temperature: Celsius o C are an international unit of temperature (technically a derived SI Unit) Water Melts Boils o F 32 212 o C 0 100 Celsius -> Fahrenheit: T F = 9/5 T C + 32 o F Fahrenheit -> Celsius: T C = 5/9 (T F - 32 o F) The base SI unit of Temp is ºK, T K = T C +273.15º 1-1111, Wikimedia, Creative Commons A. S.-A. 3.0 Unit Conversions Mathematical rules for working with quantities with units – Can only add or subtract quantities with the same units Must convert to same units when necessary – Units are carried along in multiplication and division
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9/25/10 3 Unit Conversions • Examples: – Simple Case: The Earth’s core is ~3500 km thick. The Earth’s mantle is ~2900 km thick. •Together the Earth’s core and mantle are: 3500 km + 2900 km = 6400 km thick. (same units) –More difficult: •The average ocean depth is 3.8 km. •Sunlight penetrates about 200 m into the ocean. •How much of the ocean is dark? -- need to convert so that units are the same: 3.8 km = 3800 m. 3800 m – 200 m = 3600 m. USGS , presumed Public Domain Multiplying or dividing Units When two quantities are multiplied or divided, the units are also multiplied or divided, becoming compound units: Salinity of 1 liter of seawater containing 35 grams of dissolved salt: 35 gm = 35 gm/liter 1 liter •Speed of a tsunami wave that crosses 1000 km of ocean in 1.5 hours: Hannes Grobe, wikimedia, CC A S-A 2.5
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9/25/10 4 QUESTIONS?
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