52_100_Lecture_9_20_07

# 52_100_Lecture_9_20_07 - Density The Th quality or...

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Density The quality or condition of being dense Mathematically, density is mass divided by volume (g/mL) The more mass per volume the more dense A small lead sinker is more dense than a tree Density of lead = 11.4 g/mL Density of Oak = 0.8 g/mL More dense materials will sink lower in water than those less dense

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Density of Gases Gas densities at STP: 0 o C, 1 atm .0898 g/L H 2 0.0898 g/L He – 0.179 g/L N 2 – 1.25 g/L 43 /L O 2 – 1.43 g/L CO 2 – 1.96 g/L CO – 2.14 g/L SF 6 – 6.5 g/L he less dense a gas the higher it will float The less dense a gas the higher it will float
Hindenburg 808.3 ft in length (more than 8 football fields), 135 feet in diameter Largest aircraft to ever fly Was filled with H 2 because the U.S. controlled most helium and idn’t trust the Nazis didn t trust the Nazis Burned up on May 6, 1937 while landing at Lakehurst N.J. 36 people were killed Static spark while hydrogen gas was venting during landing believed to be the cause of the fire.

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Hydrogen A colorless, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe, used in the production of synthetic ammonia and methanol, in petroleum refining, in the hydrogenation of organic materials, as a reducing atmosphere, in oxyhydrogen torches, and in rocket fuels Discovered by Henry Cavendish in 1776 Symbol: H Atomic Number: 1 Atomic Mass: 1.0078 g/mol

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Issues with Nuclear Power Plants Fear of a nuclear explosion Not realistic – need to have a critical mass for an explosion eactors are designed to produce slow and continuous release of Reactors are designed to produce slow and continuous release of energy clear f el rods ha e lo concentration of U 35 ( 2 %) bombs Nuclear fuel rods have low concentration of U-235 (~2-3%) bombs need > 90%.
Issues with Nuclear Power Plants Other types of accidents id t l h ti th th id t fi

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52_100_Lecture_9_20_07 - Density The Th quality or...

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