GP Solids Fluids

Which one of the following devices is sued to measure atmospheric pressure?

  1. Ammeter
  2. Barometer
  3. Potentiometer
  4. Lactometer


An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Potentiometer is essentially a voltage divider used for measuring electric potential (voltage). A lactometer is used to check purity of cow's milk.

The correct option is B.