Data: V (volume of hydrogen in the radiosonde) = 10 m3; m1 (shell mass) = 600 g (0.6 kg).
Constants: ρ1 (hydrogen density) = 0.0898 kg / m3; ρ2 (air density) = 1.225 kg / m3; g (acceleration due to gravity) = 9.81 m / s2.
The maximum weight of the equipment lifted by the radiosonde is determined from the equality: Fa = ρ2 * g * V = Fт = (m1 + m2) * g + P3 = (m1 + ρ1 * V) * g + P3, whence
P3 = ρ2 * g * V – (m1 + ρ1 * V) * g.
Calculation: P3 = 1.225 * 9.81 * 10 – (0.6 + 0.0898 * 10) * 9.81 = 105.48 N.
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