The monometer measures pressure of what quantity?

• A. Pressure
• B. Temperature
• C. Humidity
• D. Volume

Answer: (A)

Measuring pressure is what a monometer does. It uses a column of liquid to balance the pressure from a gas or system against atmospheric pressure, so the height difference in the liquid directly reflects the pressure difference. That means the quantity being read is pressure (force per unit area). It won’t give you temperature, humidity, or volume, which require other instruments: a thermometer for temperature, a hygrometer for humidity, and separate methods or devices to determine how much space something occupies or how much gas is present. In use, you connect the monometer to the system and read the liquid height to determine the pressure, usually expressed in units such as pascals or millimeters of mercury depending on the fluid used.