View source for Molecular Scale Temperature

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'''Molecular Scale Temperature'''
 (''symbol T<sub>M</sub> 
'') 
</dt><BR/>An atmospheric parameter defined by ''T<sub>M</sub> = (M<sub>0</sub> / 
M)T'' where ''M<sub>0</sub>'' is the mean molecular weight at sea level, 
''M'' is the mean molecular weight at altitude, and ''T'' is air 
temperature at altitude. 
</dd><BR/>''Up to an altitude of about 90 kilometers, the molecular composition of 
air is constant; thus M<sub>0</sub> / M = 1 and T <sub>M</sub> = T. Above 90 
kilometers, M<sub>0</sub> / M is greater than unity, and T <sub>M</sub> is 
greater than T. ''[[/a>|/a>
]]
==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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