Airspeed is generally displayed as a Knot (kt), but may be displayed in Miles per Hour (MPH) or Kilometers per Hour (KPH).Pilot Handbook of Aeronautical Knowledge, Airspeed indicator (ASI).This dimensional change is measured by a rocking shaft and a set of gears that drives a pointer across the instrument dial.Conservation of Energy states that total pressure must remain the same and therefore as the Pitot pressure increases or the static pressure decreases, the diaphragm expands.Alternate static sources are typically less accurate.Most aircraft have an alternate static source intended for use when the primary static source is blocked and is especially important when in instrument meteorological conditions (IMC).Some Pitot tubes are electrically heated to prevent clogging with ice.Ram Air can also be termed as total pressure.
"Ram air" is the air captured through the opening of the Pitot tube by the passage of the aircraft through the air.Some aircraft will have more than one port to more accurately measure pressure during slips and skids.The location is chosen at a location to most accurately detect prevailing atmospheric pressure (parallel to air stream) and avoid dynamic (ram) air pressure.The static pressure is captured through the static port(s) located on the side of the fuselage.Simply stated, ram air is pushed against a diaphragm, which is compared to the static pressure.Airspeed is a measure of differential pressure between the pitot (impact/dynamic pressure) and static pressures.
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