Weather InstrumentsWeather Instruments

How do we study the weatherHow do we study the weather

•• Meteorologists study the weather byMeteorologists study the weather byrecording and looking at their datarecording and looking at their data

•• They collect data by using differentThey collect data by using differentweather instrumentsweather instruments–– Thermometer, barometer, hygrometer, andThermometer, barometer, hygrometer, and

many moremany more

ThermometerThermometer

•• A thermometer measuresA thermometer measuresthe air temperature.the air temperature.Thermometer are closedThermometer are closedglass tubes containingglass tubes containingalcohol or mercury. Whenalcohol or mercury. Whenair around the tube heatsair around the tube heatsthe liquid, the liquidthe liquid, the liquidexpands and moves upexpands and moves upthe tube. A scale thenthe tube. A scale thenshows what the actualshows what the actualtemperature is.temperature is.

BarometerBarometer

•• A barometer measuresA barometer measuresthe air pressure. It tellsthe air pressure. It tellswhether or not thewhether or not thepressure is rising orpressure is rising orfalling. A rising barometerfalling. A rising barometermeans sunny and drymeans sunny and dryconditions, while a fallingconditions, while a fallingbarometer means stormybarometer means stormyand wet conditions.and wet conditions.

HygrometerHygrometer

•• A hygrometerA hygrometermeasures the watermeasures the watervapor content in thevapor content in theair or the humidity.air or the humidity.

AnemometerAnemometer

•• An anemometer isAn anemometer isused to measures theused to measures thespeed of the wind.speed of the wind.

Rain GaugeRain Gauge

•• A rain gauge measureA rain gauge measurehow much rain hashow much rain hasfallen. There arefallen. There aredifferent types thatdifferent types thatare grouped by howare grouped by howthey operate:they operate:recording rain gauge,recording rain gauge,non recording rainnon recording raingauge, and raingauge, and rainintensity gauge.intensity gauge.

Your Task!Your Task!

•• Your task today it to build a weatherYour task today it to build a weatherinstrument that can help you study theinstrument that can help you study theweatherweather