Standard temperature variation at different altitudes (up to 105 km)
Sea level temperature
Celsius (°C)
Fahrenheit (°F)
Kelvin (K)
Rankin (°R)
Altitude (H)
foot (ft)
kilometer (km)
meter (m)
mile (mi)
yard (yd)
Altitude temperature
Celsius (°C)
Fahrenheit (°F)
Kelvin (K)
Rankin (°R)
Presurre:
Atmosphere (atm)
bar (bar)
hectoPascal (hPa)
inch Mercury (in-Hg)
killo Newton per sq. meter (kN/m^2)
kilogramforce per square centimeter (kgf/m^2)
kiloPascal (kPa)
millibar (mbar)
millimeter - Mercury (mm-Hg)
Newton per sq. meter (N/m^2)
Pascal (Pa)
Pound per sq. foot (lb/ft^2)
Pound per sq. inch (psi)
Torr (torr)
Density:
gram per cubic centimeter (g/cm^3)
kilogram per cubic meter (kg/m^3)
kilogram per liter (kg/L)
milligram per cubic centimeter (mg/cm^3)
milligram per liter (mg/L)
ounce per galon (oz/gal)
ounce per cubic foot (oz/ft^3)
ounce per cubic inch (oz/in^3)
pound per cubic foot (lb/ft^3)
pound per cubic inch (lb/in^3)
Sound Speed:
centimeter per second (cm/s)
foot per hour (ft/h)
foot per minute (ft/min)
foot per second (ft/s)
inch per second (in/s)
kilometer per hour (km/h)
kilometer per minute (km/min)
kilometer per second (km/s)
Mach Number (M)
meter per second (m/s)
mile per hour (mi/h)
notical mile per hour (nmi/h)
yard per second (yd/s)
Temperature Ratio:
T (Altitude) / T (Sea level)
Pressure Ratio:
P (Altitude) / P (Sea level)
Density Ratio:
D (Altitude) / D (Sea level)
Definition
Values
▲
Pressure altitude
The altitude determined by comparing the ambient pressure of air to the standard pressure of the standard atmosphere.
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Density altitude
The altitude determined by measuring the actual air density and comparing it to the standard atmosphere.
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Geometric altitude Z
Actual height measured from sea level.
E-earth radius
E = 6356.766 km
Geopotential altitude H
Altitude based on the variation in the earth gravity as a function of altitude.
Sea level standard temperature T
_{0}
T
_{0}
= 288.15 K = 15 ̊C
Standard sea level pressure P
_{0}
P
_{0}
= 101 325 Pa
Sea level standard density
ρ
_{0}
= 1.225 kg/m
^{3}
Sea level gravitational acceleration g
g = 9.806 65 m/s
^{2}
Universal gas constant R
R = 8.314 47 J/(mol∙K)
Molar mass of dry air M
M = 0.028 964 4 kg/mol
Speed of sound c
c = 340.3 m/s
Viscosity
1.789∙10
^{-5}
(kg∙s)/m
Kinematic viscosity
1.460∙10
^{-5}
m
^{2}
/s
Thermal conductivity
0.025 96 (W∙K)/m
Specific heat C
_{p}
C
_{p}
= 1005 (J∙K)/kg
Specific heat C
_{v}
C
_{v}
= 717.98 (J∙K)/kg
Ratio of specific heats
1.4