1.
Vocabulary
 air pressure
 barometer
 Humidity
 psychrometer
 Temperature
 thermometer

2.
Weather
 the state of the atmosphere at a place
and time as regards heat, dryness,
sunshine, wind, rain, etc.

3.
Measuring pressure
 The atmosphere around us presses on
the surfaces of the Earth as well as all
the things on the Earth.
 The pressure exerted by the
atmosphere on the surface of the Earth
is known as atmospheric pressure.

4.
Weather Instruments
 Barometer- measures the atmospheric
pressure in millibar. (mbar)

5.
The atmospheric pressure
is the highest at the sea
level.
This is because all the air
above the sea presses on
the sea surfaces.
There is less air pressing on
the top of mountains than on
the sea level.
Hence, the atmospheric
pressure is lower on higher
grounds.

6.
Measuring temperature
 Temperature is the measure of how hot
or cold something is. It is measured
using a thermometer.

7.
Measuring humidity
 Humidity refers to the amount of water
vapor in the air. Humidity is low when
there is little water vapor in the air.

8.
Psychrometer
 an instrument used to measure relative
humidity compares. Relative compares
the amount of