ATOC 181 Lecture Notes - Lecture 3: Advection, Heat Capacity, Fluid Parcel
12 Oct 2017
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Energy: capacity to do work on some object or fluid. Kinetic energy (ke): energy of a moving object (1/2 mass x velocity squared) Internal energy (ie): collective microscopic kinetic and potential energy of molecules in a substance. Radiant energy (re): energy associated with electromagnetic waves (photons); emitted by all bodies at temperatures above 0 k. Energy can"t be created or destroyed, merely changes form. Heat added = work done + internal energy gained. Heating must be balanced by work and/or increase in internal energy. In air, work is mainly expansion/compression of a certain amount of air. Temperature: a measure of the average kinetic energy of the atoms and molecules within a substance. At absolute zero (0 k = -273. 15 c), atomic motion ceases. Measured in c, f, or using kelvin scale (k) Celcius: 0 c (water melts), 100 c (boils) Kelvin or absolute scale: t in k = t in c + 273. 15.
