ATOC 181 Lecture Notes - Lecture 5: Aurora, Atmospheric Pressure, Phase Transition
16 Jan 2017
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Document Summary
In this chapter: energy, temperature, heat, heat transfer in the atmosphere, radiation and the global energy balance (in part b, solar particles and the aurora. Energy: capacity to do work on some object/fluid: work = when force pushes/pulls/lifts matter, e. g. Internal combustion engine = chemical e converted to mechanical work: e. g. Lifting brick = exert force to oppose gravity and raise object: unit of energy = joules = 1(kg m^2 s^-2) Internal energy (u: collective microscopic kinetic + potential energy of molecules in a substnace. Important thermodynamic quantity: radiant energy (re, e associated w/ electromagnetic (em) waves (photons); emitted by all bodies at temperatures above 0k, other = chemical potential/electrical potential/nuclear. First law of thermodynamics states: energy cannot be created or destroyed, heat added = work done + internal e gained, heating = balanced by work/increase in internal e. In air = work mainly expansion/compression of certain amount: without external heating/cooling, work balanced by changes to internal energy (adiabatic processes)
