GEOG 214 Lecture Notes - Lecture 1: Radiant Flux, Radiant Energy, Infrared Thermometer
22 Feb 2016
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Document Summary
Energy is the ability to do work, and work is done when a unit force acts over unit distance. acceleration ms-2 constant velocity dfe. N x m = kg x ms-2 x m = kgm2s-2 = joule (j) Power = energy time = j/s = watts (w) Energy/heat flux density q: rate of energy flow per unit surface area. = watt / metrer2 = wm-2 or js-1m-2. Radiant energy electromagnetic waves (sun, hot fire, clouds, any object) Sensible heat thermal energy we can feel (warm air) Latent heat due to phase changes of a substance, especially water (cooling we feel after getting out of the swimming pool) Chemical energy fixed in conversion of co2 to carbohydrate (ch2o) (photosynthesis) Kinetic energy due to motion (winds) Geopotential energy due to position in gravitational field. Physics that deals with the relationships and conversions between heat and other forms of energy.
