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→Vertical speed indicator (power)
=== Vertical speed indicator (power) ===
A vertical speed indicator is a differential instrument: it works by differentiating the static pressure to obtain the rate of climb or descent. In particular, the following relationship holds:
\[ V_S= -\frac{1}{\rho g} \frac{dp}{dt} \]
=== Total energy in gliding: a more interesting quantity ===
