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 For velocities of air at temperatures other than 70 F, Figure 2-26 gives
tabulated velocity pressures.
Instruments such as the rotating vane anemometer and deflecting vane
velometer actually depend on velocity pressure to move an object against a
The velocity readout is based on air at 70 F. If the air
being measured is significantly different from 70 F, the velocity reading
must be corrected by the ratio of absolute temperatures. This can be simply
done by:
460 + T
V=
x instrument reading
460 + 70
actual corrected velocity
where: V =
=
actual air temperature, F
T
FIGURE 2-27
Velocity Probe is Affected by Static Pressure,
Even When There is no Airflow
2-26
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