# Manometer - Example 1

Example 1:

Figure above shows a manometer containing mercury connected to a tank with methane liquid and gas. Find the pressure of the gas supply in the units cmHg and Pa.
[Density of mercury = 13.6 x 10³ kg/m³; atmospheric pressure = 76 cmHg]

Pressure of the gas in cmHg

P = 20 + 76 = 96 cmHg

Pressure of gas in Pa
The atmospheric pressure,
$P atm =(0.76)(13.6× 10 3 )(10)=103,360Pa$ Pressure of the gas,
$P=hρg+ P atm P=(0.2)(13.6× 10 3 )(10)+103,360=130,560Pa$