Ch3 Adaptations to the Physical Environment7.pdf

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University College Courses
Spencer Barrett

Heat Gain and Loss in Thermal Environments  the temperature of a surface reflects its heat content  each object and orgnm on earth continually exchanges heat with its surroundings  heat is conducted from warmer to cooler substances (i.e. if envmt is cooler than orgnm, the orgnm loses heat to it and cools down)  radiation is the emission of electromagnetic NRG by a warm surface, which may then be absorbed by any cooler surface  sources of radiation: sun, sky (scattered light), landscape (which radiates heat it has absorbed from the sun)  lizards basking on rocks gain heat directly by radiation from the sun  rate of NRG loss by radiation depends on temp. of radiating surface  radiation increases w/ the 4 power of absolute temp. (K; absolute zero is 0K, which equals to -273°C) o ex. an orgnm with skin temp 37°C (310K) radiates heat 30% faster than one with 17°C (290K)  at night, warmed objects radiate their stored heat to colder parts of the envmt  conduction is the transfer of kinetic NRG of heat b/w substances in contact w/ one another  a vacuum (which lacks all substance) conducts no heat  water (denser than air) conducts >20 times faster than air  the rate which heat passes b/w an orgnm and its surroundings depend on:  the insulating value of the organism’s surface (its resistance to heat transfer)  its surface area  t
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