Difference between revisions of "Homogeneous atmosphere"

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#<div class="definition"><div class="short_definition">A hypothetical [[atmosphere]] in which the [[density]] is constant with  height.</div><br/> <div class="paragraph">The [[lapse rate]] of [[temperature]] in such an atmosphere is known as the [[autoconvective lapse  rate]] and is equal to ''g''/''R'' (or approximately 3.4&#x000b0;C/100 m), where ''g'' is the [[acceleration of gravity]]  and ''R'' is the [[gas constant]] for air. A homogeneous atmosphere has a finite total thickness that is  given by ''R''<sub>''d''</sub>''T''<sub>''v''</sub>/''g'', where ''R''<sub>''d''</sub> is the [[gas constant]] for [[dry air]] and ''T''<sub>''v''</sub> is the [[virtual temperature]] (K)  at the surface. For a [[surface temperature]] of 273 K, the vertical extent of the homogeneous  atmosphere is approximately 8000 m. At the top of such an [[atmosphere]] both the [[pressure]] and  [[absolute]] temperature vanish.</div><br/> </div>
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#<div class="definition"><div class="short_definition">A hypothetical [[atmosphere]] in which the [[density]] is constant with  height.</div><br/> <div class="paragraph">The [[lapse rate]] of [[temperature]] in such an atmosphere is known as the [[autoconvective lapse rate|autoconvective lapse  rate]] and is equal to ''g''/''R'' (or approximately 3.4&#x000b0;C/100 m), where ''g'' is the [[acceleration of gravity]]  and ''R'' is the [[gas constant]] for air. A homogeneous atmosphere has a finite total thickness that is  given by ''R''<sub>''d''</sub>''T''<sub>''v''</sub>/''g'', where ''R''<sub>''d''</sub> is the [[gas constant]] for [[dry air]] and ''T''<sub>''v''</sub> is the [[virtual temperature]] (K)  at the surface. For a [[surface temperature]] of 273 K, the vertical extent of the homogeneous  atmosphere is approximately 8000 m. At the top of such an [[atmosphere]] both the [[pressure]] and  [[absolute]] temperature vanish.</div><br/> </div>
 
#<div class="definition"><div class="short_definition"><br/>''Same as'' [[adiabatic atmosphere]].</div><br/> </div>
 
#<div class="definition"><div class="short_definition"><br/>''Same as'' [[adiabatic atmosphere]].</div><br/> </div>
 
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Latest revision as of 17:09, 25 April 2012



homogeneous atmosphere

  1. A hypothetical atmosphere in which the density is constant with height.

    The lapse rate of temperature in such an atmosphere is known as the autoconvective lapse rate and is equal to g/R (or approximately 3.4°C/100 m), where g is the acceleration of gravity and R is the gas constant for air. A homogeneous atmosphere has a finite total thickness that is given by RdTv/g, where Rd is the gas constant for dry air and Tv is the virtual temperature (K) at the surface. For a surface temperature of 273 K, the vertical extent of the homogeneous atmosphere is approximately 8000 m. At the top of such an atmosphere both the pressure and absolute temperature vanish.