Read the text. Then answer questions 1 to 3.

Weather Instruments 
     

     In order to measure the weather, weather instruments such as a thermometer, a barometer, a rain gauge, a wind vane and a weather map are needed. A thermometer measures the air temperature. When the air is hot, the liquid in the closed glass tube moves up, and when it is cold, it goes down. A barometer measures air pressure. When the weather is sunny and dry, the pressure goes up, but when it is rainy or stormy, it drops. A rain gauge measures the amount of rain over a certain period of time, and a wind vane determines the direction the wind is blowing. A weather map shows atmospheric conditions of the Earth's surface. Meteorologists examine the weather map and predict the weather.