The document discusses the pitot tube, an instrument used to measure fluid pressure and flow rates. It was invented in the early 1700s by a French engineer named Henri Pitot and modified in the 1800s. It works by measuring the height difference of mercury in a manometer, which can determine flow velocity. Some applications of the pitot tube include measuring airspeed on airplanes, determining coolant flow in rooms, and measuring wind speed in tunnels. The document provides an example calculation for determining air flow speed using measurements from a pitot tube and manometer.

1. Bogor Chemical Analyst Vocational High School
2012

2. Muhammad
Nurul Maulida R
Noviani
Nur Azizah
Ramadhan
Ester

3. Pitot tube is an instrument that use
An Engineer from France
to measure the pressure and flow
named Henri Pitot in the
rate of fluid (air)
beginning of 1700 and
modified to modern design in
Henri Pitot
the middle of 1800 by France
Scientist named Henry Darcy

4. Work Principle
With measuring the height differences of mercury
in the manometer, the velocity of fluid can be
determined in the pitot tube.
Pitot Tube

5. Pitot Tube Formula
P = Pressure (Pa)
p = density (kg/m3)
p’ = density Hg (kg/m3)
g = gravitation (m/s2)
h = high (m)
v = velocity (m/s)

6. • Measure air speed on the airplane.
• Determine the amount of coolant that was in
the room to tell at a hotel.
• Determine the speed of the wind in the
tunnel.
• Venturimeter with manometer

7. How to work?
Pitot Tube
Plane’s
Application plane’s
Altimeter
One the Application of pitot tube is on the
altimeter. Altimeter’s function is to measure height of
one point from the sea surface
Pitot Tube

8. If air (p = 129 kg/m3) flowed into the pipe pitot, and
the difference in height of mercury (pHg = 13.6 g/cm3)
at the manometer 3 cm.
Calculate the air flow speed!

9. Known : p = 129 kg/m3
p’ = 13,6 g/cm3
g = 10m/s2)
h = 3 cm
Ask : v…?
Answer :

10. Conclusion
• Pitot tube is an instrument that use to measure the
pressure and flow rate of fluid (air)
• The same manometer feet high, then h1 = h2
• The air that is flowing at first much smaller
tubes, then v1=0
• Has this formula :

11. Any Question  ?