Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For First Responders · Standard Atmosphere

Standard Atmosphere for a ballistic capsule

Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a ballistic capsule live below — adjust the inputs and watch it respond, right in your browser.

Standard Atmosphere (ISA)Live

temperature, pressure, density

Controls

Presets

Altitude (m)

The International Standard Atmosphere is the reference model all aircraft and instruments are calibrated against. Temperature falls steadily through the troposphere at 6.5 °C/km, then holds constant in the stratosphere above the tropopause. Pressure and density decay roughly exponentially — at airliner altitude the air is only a quarter as dense as at sea level.

▶ Run in Python

Data Inspector

Temperature-50.0 °C

Pressure26.4 kPa

Density0.413 kg/m³

% sea-level ρ34%

Governing equation

T = T_{0} - L h = 288.15 - 0.0065 \cdot 10000 = 223.1 K, p = p_{0} (\frac{T}{T _{0}})^{g / (L R)} = 26.4 kPa

Reading this result: Below the 11 km tropopause, temperature falls at 6.5 °C/km — here it is -50 °C and the air holds 34% of sea-level density.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

Also for:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students General version →

More with Standard Atmosphere

Standard Atmosphere for a passenger jet wing Standard Atmosphere for a rocket ascent Standard Atmosphere for a drone quadcopter Standard Atmosphere for a glider Standard Atmosphere for a paper airplane Standard Atmosphere for a Mars lander Standard Atmosphere for a satellite reentry Standard Atmosphere for a model rocket

Frequently asked questions

Is this good for first responders?: Yes — this version of "Standard Atmosphere for a ballistic capsule" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.