MOISTURE IN THE ATMOSPHERE

K.SUGUNA.R

PGT GEO

EVAPORATION AND CONDENSATION

EVAPORATION:THE PROCESS OF CHANGING OF WATER INTO WATERVAPOUR

DUE HEATING OF THE ATMOSPHERE CONDENSATION:THE PROCESS OF CHANGING OF

WATERVAPOUR INTO WATER DUE TO COOING OF THE ATMOSPERE

HUMIDITY ABSOLUTE HUMIDITY:ACTUAL AMOUNT OF WATERVAPOUR

PRESENT IN THE ATMOSPHERE RELATIVE HUMIDITY: RATIO BETWEEN THE AMOUNT OF

WATERVAPOUR PRESENT IN THE ATMOSPHERE AND THE AMOUNT OF WATER VAPOUR IT CAN HOLD AT A PARTICULAR PARTICULAR TEMPERATURE

FORMS OF CONDENSATION

DEW FROST FOG AND MIST CLOUDS

DEW MOSTURE DEPOSITED IN THE FORM OF WATER

DROPLETS ON STONES GRASS BLADES PLANT LEAVES IDEAL CONDITIONS- CLEAR SKY,CALM AIR,HIGH

RELATIVE HUMIDITY,COLD AND LONG NIGHTS.

FROST MOISTURE DEPOSITED IN THE FORM OF ICE CRYSTALS. WHEN CONDENSATION TAKES PLACE BELOW FREEZING

POINT. IDEAL CONDITIONS- CLEAR SKY,CALM AIR,HIGH

RELATIVE HUMIDITY,COLD AND LONG NIGHTS. AIR TEMPERATURE BELOW THE FREEZING POINT.

FOG AND MIST FOG IS A CLOUD WITH ITS BASE NEAR TO THE GROUND. MIST FORMS WHEN THE RISING WARM AIR UP THE

SLOPES MEETS A COLD SURFACE. THE ONLY DIFFERENCE BETWEEN MIST AND FOG IS THAT

MIST CONTAINS MORE MOISTURE THAN THE FOG.

CLOUDS CLOUD IS A MASS OF MINUTE WATER DROPLETS FORMED BY CONDENSATION OF WATERVAPOUR IN FREE AIR

AT CONSIDERABLE ELEVATION.

PRECIPITATION

THE FALLING OF WATER THROUGH THE ATMOSPHERE TO THE EARTH SURFACE

FORMS OF PRECIPITATION

RAIN FALL SNOW FALL SLEET HAIL STONE

RAINFALL

THE PRECIPITATION IN THE FORM OF WATER

CONDENSATION TAKES PLACE ABOVE FREEZING POINT

SNOW FALL THE PRECIPITATION IN THE FORM OF FINE FLAKES OF

SNOW CONDENSATION TAKES PLACE BELOW FREEZING

FREEZING POINT MOISTURE IS RELEASED IN THE FORM OF HEXAGONAL

CRYSTALS THESE CRYSTALS FORM FLAKES OF SNOW

SLEET FROZEN RAINDROPS AND REFROZEN MELTED SNOW WATER WARM LAYER OF AIR LIES ABOVE COLD LAYER RAIN DROPS WHICH LEAVE THE WARM LAYER ENCOUNTER THE COLD

AIR BELOW. AS A RESULT THEY SOLIDIFY AND REACH THE GROUND AS SMALL

PELLETS OF ICE NOT BIGGER THAN THE RAIN DROPS FROM WHICH THEY ARE FORMED

HAILSTONE DROPS OF RAIN AFTER BEING RELEASED BY THE CLOUDS BECOME

SOLIDIFIED INTO SMALL ROUNDED SOLID PIECES OF ICE FALLING RAINDROPS CARRIED AWAY BY STRONG CONVECTIONAL

CURRENTS THEY GET COOLED AND SOLIDIFIED AND FALL AS HAILSTONES

TYPES OF RAIN

CONVECTIONAL RAIN OROGRAPHIC RAIN CYCLONIC RAIN

CONVECTIONAL RAIN

RAIN IS CAUSED BY CONVECTIONAL AIR CURRENTS COMMON IN EQUATORIAL REGIONS HEAVY RAIN ASSOCIATED WITH LIGHTNING AND

THUNDER

OROGARPHIC RAIN

CAUSED BY RELEIF OR A MOUNTAIN WINDWARD SIDE RECEIVES MORE RAINFALL LEEWARDSIDE RECEIVES NO OR LESS RAINFALL

CYCLONIC RAIN CAUSED BY CYCLONE HEAVY RAIN ALONG THE COASTAL REGIONS CAUSES DEMAGES TO THE LIFE AND PROPERTIES