Gas pressure is tested using a

Gas pressure is tested using a

• A. Barometer
• B. Vacuum gauge
• C. Thermometer
• D. Manometer

Answer: (D)

Gas pressure testing uses a manometer because it directly measures the pressure difference by observing the height change of a liquid in a tube. When you connect it to the gas line, the gas pressure pushes the liquid up or down, and the vertical difference translates into a readable pressure value (often in inches of water). This is ideal for the small, precise pressures used in gas appliances. A barometer measures atmospheric pressure, not the pressure inside a gas line, so it wouldn’t reflect the actual line pressure. A vacuum gauge is designed to read negative or near-vacuum pressures, not the positive supply pressure. A thermometer measures temperature, which isn’t related to measuring gas pressure in this context.

Gas pressure testing uses a manometer because it directly measures the pressure difference by observing the height change of a liquid in a tube. When you connect it to the gas line, the gas pressure pushes the liquid up or down, and the vertical difference translates into a readable pressure value (often in inches of water). This is ideal for the small, precise pressures used in gas appliances. A barometer measures atmospheric pressure, not the pressure inside a gas line, so it wouldn’t reflect the actual line pressure. A vacuum gauge is designed to read negative or near-vacuum pressures, not the positive supply pressure. A thermometer measures temperature, which isn’t related to measuring gas pressure in this context.