ATPL Theory

Nonstd Temperature

Pressure vs Height – ISA

Comparison of pressure decrease with height for standard atmosphere (ISA) and warmer/colder air columns (simplified troposphere model).

Height

Temperature offset

ISA (standard)
Warm column (T₀ + ΔT)
Cold column (T₀ − ΔT)

Values at selected height

Height h
-
p (ISA)
-
p (warm)
-
p (cold)
-
T₀ (warm)
-
T₀ (cold)
-
Warmer air ⇒ pressure decreases more slowly with height (larger scale height).
Colder air ⇒ pressure decreases faster.