Wind pressure airflow wind resistance

                                            Wind pressure airflow wind resistance

Air flow rate (Q) : the so-called air volume, volume flow rate) refers to the duct through the air by the cross-sectional area of flow velocity, generally represented on the use of the following type:
Q = 60 va
Q = m3 / min (air)
V (wind speed) = m/SEC
A (cross-sectional area) = m2
Conversion formula 1 pa = 0.102 mmAq commonly used pressure
1 mbar mmAq = 10.197
1 MMHG mmAq = 13.6
1 psi mmaq = 703
1 torr = 133.3 pa
1 torr = 1.333 mbar
Commonly used unit conversion table - volume 1 m3 / min (CMM) = 1000 l/min = 35.31 ft3 / min (CFM)
Common nouns that (1) the standard state: is 20 ℃, and 760 MMHG absolute pressure, relative humidity 65%. This state abbreviation for STP, generally in the state of 1 m3 air weight is 1.2 kg.
(2) the absolute pressure of the air: for the local atmospheric pressure gauge shows the sum of atmospheric pressure plus table, generally represented by KGF/m2 or mmaq.
(3) benchmark status: 0 ℃, absolute pressure, 760 MMHG, relative humidity 0%. This state (NTP) for short, generally in the state of 1 m3 air weight is 1.293 kg.