A manometer is connected to a gas containing bulb The open arm reads `43.7 cm` where as the arm connected to the bulb reads `15.6 cm` If the barometric pressure is 743mm mercury What is the pressure of gas in bar ? .

Explanation

Excess pressure of the gas `= 43.7 - 15.6 = 28.1 cm = 281 mm`
Total pressure of the gas `= 743 + 281 = 1024 mm`
Now, `1 atm` (or `760 mm`) `= 1.013 "bar"`
`: . 1024 mm` pressure `= ((1.013 "bar"))/((760 mm)) xx (1024 mm) = 1.365 "bar"`.