Pressure is lower at higher altitudes; temperature is highest in the outer atmosphere.
The thermosphere, the second-highest layer of the atmosphere, stretches from the mesopause, which divides it from the mesosphere, at an altitude of roughly 260,000 feet, up to the thermopause, which is located at an altitude between 1,600,000 and 3,300,000 feet.
The thermosphere's temperature rises to maximum values that are greatly influenced by the level of solar activity. Vertical exchanges related to dynamical mixing become unimportant, whereas molecular diffusion emerges as a prominent process that results in the gravitational separation of species according to their molecular or atomic weight.
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