____________ measured by a portable instrument called the barometer.

The average ___________ at sea level is about 1013 millibars.

___________ are narrow glass tubes filled with either mercury or alcohol.

The direction of wind is observed with the help of an instrument called the ____________.

____________ refers to a stable pattern of weather conditions of a region which includes average temperature,rainfall,pressure,humidity etc.

____________ helps in weather forecasting.

____________ is measured by an instrument called the hygrometer.

The ____________ is the highest at sea level and goes on decreasing with the increase in altitude.

______________ instrument is placed in an open area away from the trees,buildings or any other object which can obstruct the incoming rain water.

___________ is used for the continuous recording of humidity in the air.