SCIENCE (NOTE)
Tuesday 16 October 201203:29
WATER AND SOLUTION
^_^ EVAPORATION OF WATER
1. WATER MOLECULES AT THE SURFACE OF WATER ESCAPE INTO THE ATMOSPHERE
DURING EVAPORATION
(LIQUID STATE > GAS STATE)
2. FACTORS AFFECTING THE RATE OF EVAPORATION OF WATER
- TEMPERATURE OF THE SURROUNDINGS
- AIR MOVEMENT,WIND
- AIR HUMIDITY
- SURFACE AREA OF WATER
3. COMPARISON BETWEEN BOILING AND EVAPORATION :
- BOTH PROCESSES ABSORB HEAT FROM THE SURROUNDING
- BOTH INVOLVES CHANGE OF STATE FROM LIQUID TO GAS
^-^ SIMILARITIES BOILING AND EVAPORATION
*BOILING
- TEMPERATURE
^-^ OCCURS AT BOILING POINT OF LIQUIDS
- RATE PROCESS
^-^ FAST
- SITE OF PROCESS
^-^ THROUGHOUT THE LIQUID
- FACTORS AFFECTING PROCESS
^-^ PRESSURE OF THE SURROUNDING
*EVAPORATION
- TEMPERATURE
^-^ OCCURS AT ANY TEMPERATURE
- RATE PROCESS
^-^ A VERY SLOW PROCESS
- SITE OF PROCESS
^-^ OCCURS ONLY AT THE SURFACE OF THE LIQUID
- FACTORS AFFECTING PROCESS
^-^ RATE DEPENDS ON
- SURFACE AREA
- SURROUNDING TEMPERATURE
- AIR MOVEMENT
- AIR HUMIDITY
4. APPLICATION OF EVAPORATION :
- DRYING CLOTHES
- PRODUCING SALT
^-^ EVAPORATION(PICTURE)
