EARTHSC 2WW3 Lecture Notes - Lecture 1: Hydrogen Bond, Surface Tension, Covalent Bond
17 May 2017
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Document Summary
Physical properties: thermal properties, most dense at: 4 degrees celsius, upon freezing expands by 9, hydrogen bonds form a strong structure, specific heat: the highest of any liquid, 4200 joules of energy. Second to ammonia: evaporation is a crucial part of the water cycle and invisible water vapor is a very powerful. Greenhouse gas: water vapor acts as a good greenhouse gas. Salt (nacl) - water can rip this apart. Substances that are electrically neutral (oil) dissolve poorly in water. Society: water means different thing in different cutures ritual washing, buddist funeral services, controlling water has morphed into environmental and symbolic concerns. Severe water scarity: <500m^3 per person per year: 28 countries have less than this. Water use: water can be used in-stream and off-stream. Where does water go: what is the external water footprint? food that gets traded away.
