ISA Troposphere Design Lab

Altitude (H) 0 m

Temp Offset (dISA) 0 °C

Display Settings

Temperature Unit

Pressure Unit

Density Unit

Speed of Sound

Temperature (T)

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ISA std: — —

Pressure (P)

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ISA std: — —

Density (ρ)

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ISA std: — —

Speed of Sound (a)

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ISA std: — —

Pressure Altitude (H_p)

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Geopotential: — Geom: — —

Atmosphere Profile

Mathematical Calculation Solver (Troposphere) LIVE COMPILATION

1. Temperature Equation

T_std = T0 + L * H

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T_actual = T_std + dISA

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2. Pressure Equation

Hydrostatic Integration Column

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3. Density Equation (Ideal Gas Law)

ρ = P / (R * T)

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4. Speed of Sound Equation

a = √(γ * R * T)

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5. Pressure Altitude Equation

H_p = H_0 + (T_0 / L) * [ (P / P_0)^(-R*L / g) - 1 ]

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6. Non-Dimensional Atmosphere Ratios

Temp Ratio (θ) = T / T0 = — | Pressure Ratio (δ) = P / P0 = — | Density Ratio (σ) = ρ / ρ0 = —

Troposphere Constants Reference (ISA)

Parameter	Symbol	Standard Sea Level Value (SI)	Standard Sea Level Value (US)
Altitude Limit (Troposphere)	H_trop	11,000 m	36,089.24 ft
Standard Sea Level Temperature	T0	288.15 K (15.0 °C)	518.67 °R (59.0 °F)
Standard Sea Level Pressure	P0	101,325 Pa (1013.25 hPa)	2,116.22 lb/ft² (29.92 inHg)
Standard Sea Level Density	ρ0	1.2250 kg/m³	0.0023769 slug/ft³
Troposphere Temp Lapse Rate	L	-0.0065 K/m	-0.0019812 °C/ft (-3.566 °F/1000 ft)
Specific Gas Constant (Dry Air)	R	287.05287 J/(kg·K)	1,716.49 ft·lb/(slug·°R)
Acceleration due to Gravity	g	9.80665 m/s²	32.17405 ft/s²
Specific Heat Ratio (Air)	γ	1.4	1.4