Question

The pressure differential gauge on an air handler reads 12 cm of H2O. What is this pressure differential in kilo Pascal?

Answer 1

Explanation:

Explanation:

g = Acceleration due to gravity = 9.81\ \text{m/s}^29.81 m/s

2

h = Height of reading = 12 cm

\rhoρ = Density of water = 1000\ \text{kg/m}^31000 kg/m

3

Pressure due to height difference is given by

\begin{gathered}P=\rho gh\\\Rightarrow P=1000\times 9.81\times 12\times 10^{-2}\\\Rightarrow P=1177.2\ \text{Pa}=1.1772\ \text{kPa}\approx 1.18\ \text{kPa}\end{gathered}

P=ρgh

⇒P=1000×9.81×12×10

−2

⇒P=1177.2 Pa=1.1772 kPa≈1.18 kPa

The pressure differential is 1.18\ \text{kPa}1.18 kPa .