Which of the following instruments is used to measure air pressure? a. thermometer b. barometer c. anemometer d. hygrometer

The correct answer is B. barometer

Thermometer is used to measure temperature, anemometer is used to measure wind speed, while a hygrometer is used to measure humidity.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.