describe how an open tube manometer can be used ti measure the pressure gas. Distinguish between absolute pressure and gauge pressure. The manual of a car instructs the ownerto inflate the types to a pressure of 200 k Pa.
a) What is the recommended gauge pressure?
b) What is the recommended absolute pressure?
c) If after the required inflation of the tyres, the car is driven to a mountain peak where the atmospheric pressure is 10 percent below at sea level, what will tyre gauge read?
a) What is the recommended gauge pressure?
b) What is the recommended absolute pressure?
c) If after the required inflation of the tyres, the car is driven to a mountain peak where the atmospheric pressure is 10 percent below at sea level, what will tyre gauge read?
Dear student,
Find the answer to your query as under:
An open-tube manometer gives the pressure of gas by measuring the difference in the level of the gas in the two limbs of the manometer.
Absolute Pressure is the sum of the available atmospheric pressure and the gauge pressure of the system.
Absolute Pressure = Gauge Pressure + Atmospheric Pressure
Now,
To measure the pressure of air in the tyres we should use the gauge pressure because there in no atmosphere inside the tyre as only pressurised air is there at gauge pressure and hence only gauge metre should be used.
(a) in gauge pressure metre it would read = 200 kPa
(b) in absolute pressure metre it would read = 200kPa + Patm = 200kPa + 101 kPa = 301 kPa
(c) The gauge metre will still read the same as the tyres are filled at gauge pressure and not at atmospheric pressure so any change in the atmospheric pressure will not change the gauge pressure value inside the tyres.
Regards
Satyendra Singh
Find the answer to your query as under:
An open-tube manometer gives the pressure of gas by measuring the difference in the level of the gas in the two limbs of the manometer.
Absolute Pressure is the sum of the available atmospheric pressure and the gauge pressure of the system.
Absolute Pressure = Gauge Pressure + Atmospheric Pressure
Now,
To measure the pressure of air in the tyres we should use the gauge pressure because there in no atmosphere inside the tyre as only pressurised air is there at gauge pressure and hence only gauge metre should be used.
(a) in gauge pressure metre it would read = 200 kPa
(b) in absolute pressure metre it would read = 200kPa + Patm = 200kPa + 101 kPa = 301 kPa
(c) The gauge metre will still read the same as the tyres are filled at gauge pressure and not at atmospheric pressure so any change in the atmospheric pressure will not change the gauge pressure value inside the tyres.
Regards
Satyendra Singh
