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atomic
atomic absorption spectroscopy
Atomic Age
atomic bomb
atomic clock
atomic cocktail
atomic demolition munition
atomic emission spectroscopy
atomic energy
atomic force microscope
atomic heat
atomic mass
atomic mass unit
atomic number
atomic particle
atomic physics
atomic radius
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atmospheric pressure
at·mos·pher·ic pres·sure


noun 
Definition:
 
air pressure: the downward pressure exerted by the weight of the overlying atmosphere. It has a mean value of one atmosphere at sea level but decreases as elevation increases.
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