AIR PRESSURE

DEFINITION
AIR PRESSURE IS THE DOWNWARD FORCE EXERTED BY THE WEIGHT OF AIR PER UNIT AREA ON THE EARTH’S SURFACE.
AIR PRESSURE MAY VARY WITH ALTITUDE AND TEMPERATURE.
AIR PRESSURE IS GREATER AT THE SEA LEVEL AND DECREASES WITH INCREASING ALTITUDE.

INSTRUMENT USED
BAROMETER

BAROMETER

MERCURY BAROMETER

ANEROID BAROGRAPH

ANEROID BAROMETER

ISOBARS IS THE LINES ARE JOINING PLACES WITH EQUAL PRESSURE.
UNIT MEASUREMENT IS IN MILLIBARS
TYPES OF PRESSURE
RISING WARM AIR IS LESS DENSE AND EXERTS LOW PRESSURE.

SINKING COLD AIR IS MORE DENSE AND EXERTS HIGH PRESSURE.

AS THE RESULT OF THE DIFFERENCE IN AIR PRESSURE BETWEEN TWO PLACES WIND IS FORMED.

HIGH PRESSURE + LOW PRESSURE = WINDS

TEMPERATURE

DEFINITION
TEMPERATURE IS THE DEGREE OF HOTNESS OR COLDNESS OF THE ATMOSPHERE
MEASUREMENT
TEMPERATURE IS MEASURED IN DEGREES CELSIUS (◦ C) or DEGREES FARENHEIT (◦F)
INSTRUMENTS USED
SIX’S THERMOMETER ( MAX & MIN THERMOMETER)
Six’s Thermometer, Can you read the max temperature and min temperature?
THE FORMULA
AVERAGE (MEAN) TEMPERATURE= MAXIMUM TEMPERATURE + MINIMUM TEMPERATURE / 2 ( Maximum temp + minimum temp divided by 2)
ANNUAL (DAILY) DIURNAL RANGE TEMPERATURE = MAXIMUM TEMPERATURE - MINIMUM TEMPERATURE