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The Purdue University Impact Earth! site will calculate this for you. Clicking on the Documentation link will give you the paper of formula and approximations that are used. The equation for the breakup altitude is: $$ z_\star\approx-H\Bigl[\ln\Bigl(\frac{Y_i}{\rho_0v_i^2}\Bigr)+1.308-0.314I_f-1.303\sqrt{1-I_f}\Bigr] $$ where $H$ is the scale height of the ...

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