Discussion
Which quantity does a variometer measure?
Answer: D
A variometer is a sensitive rate of change of pressure instrument, indicating the rate of climb or descent of the aircraft. A total energy compensated variometer subtracts the contribution from changing airspeed, so that what remains approximates the vertical motion of the air, which is what a glider pilot actually wants to know. The distinction between the two is important in soaring flight. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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