What device measures changes in pressure by comparing two locations?

What device measures changes in pressure by comparing two locations?

• A. Pressure gauge
• B. Flow meter
• C. Thermometer
• D. Manometer

Answer: (D)

The device that measures changes in pressure by comparing two locations is a manometer. A manometer typically consists of a U-shaped tube filled with a liquid, such as mercury or water. One end of the tube is open to the atmosphere or another reference pressure, while the other end is connected to the pressure source being measured. The difference in liquid levels between the two sides of the U-tube indicates the pressure difference, effectively allowing the device to compare the pressure at two different locations. In contrast, while a pressure gauge also measures pressure, it does not necessarily compare two separate locations; it provides an absolute or gauge pressure reading based on a single reference point. A flow meter measures the flow rate of a fluid, which is not related to pressure changes. A thermometer measures temperature, which is an entirely different variable and does not pertain to pressure measurement. Thus, the manometer is specifically designed for the task of comparing pressures, making it the correct choice.

The device that measures changes in pressure by comparing two locations is a manometer. A manometer typically consists of a U-shaped tube filled with a liquid, such as mercury or water. One end of the tube is open to the atmosphere or another reference pressure, while the other end is connected to the pressure source being measured. The difference in liquid levels between the two sides of the U-tube indicates the pressure difference, effectively allowing the device to compare the pressure at two different locations.

In contrast, while a pressure gauge also measures pressure, it does not necessarily compare two separate locations; it provides an absolute or gauge pressure reading based on a single reference point. A flow meter measures the flow rate of a fluid, which is not related to pressure changes. A thermometer measures temperature, which is an entirely different variable and does not pertain to pressure measurement. Thus, the manometer is specifically designed for the task of comparing pressures, making it the correct choice.