MPPSC 2016 General Studies Solved Paper-1

(D) A barometer is a scientific instrument used to measure air pressure. Pressure tendency can forecast short term changes in the weather. In water-based barometer, the weather ball barometer consists of a glass container with a sealed body, half filled with water. A mercury barometer has a vertical glass tube closed at the top sitting in an open mercury-filled basin at the bottom. In cold countries,alcohol is used in barometer instead of water.