Thursday, September 4, 2008
please kindly click on the archives of september 2008 to view all the posts from chapter 7 to 9.THANKS! :)
WE JUSTLOVE PHYSICS!!
9:13 AM
FINISHED!
after two days of hard work, i have completed this entire blog
thanks to all those who have left their comments and who have viewed my blog.
and of course, thanks to those who have been asking me to ADD OIL
i never knew that bloggin can actually be so educational but yet so tiring
but i enjoyed blogging and learning at the same time
to all readers:
thanks for viewing. hope that you learn something after viewing.special thanks to :
http://sg.images.search.yahoo.com/for the pictures.
special thanks to the physics textbook which provided me with the informations :)
WE JUSTLOVE PHYSICS!!
9:06 AM
EVAPORATION:
- shows water being evaporated.
-drying of hair
drying of wet clothes
puddles of water
puddles of water
WE JUSTLOVE PHYSICS!!
9:02 AM
++ FACTORS AFFECTING THE RATE OF EVAPORATION.
1. temperature
>> higher the temperature of the liquid,
faster the rate of evaporation
!! heating a liquid will increase the rate of evaporation
2. humidity of the surrounding air
>> rate of evaporation decreases,
with increasing humidity
!! rate of evaporation increases with lower humidity
3. surface area of the liquid
>> rate of evaporation increases,
when there is more exposed surface area of the liquid
!! larger exposed surface area means more molecules can escape from the liquid
4. movement of air
>> rate os evaporation increases,
when the surrounding air is moving
5. pressure
>> reducing the atmosphere pressure,
increases the rate of evaporation.
6. boiling point of the liquid
>> liquids with lower boiling points will evaporate faster.
WE JUSTLOVE PHYSICS!!
8:47 AM
how does evaporation occur?
~ molecules of liquid are always moving randomly at different speed
~ thermal energy may be absorbed by the liquid from the surroundings
~ at the liquid suface
>> molecules are more energetic
>> are able to overcome the downard attractive forces of other molecules
>> they escapes into the atmosphere
WE JUSTLOVE PHYSICS!!
8:42 AM
appilcations of evaporation:- cooling effect on skin when applying perfume or when perspiration evaporates
- wet clothes and puddles on water on pavements dry up after a while
- sponging a patient with a high fever
- refrigerators uses priciple of condensation and evaporation in cooling process to keep its contents cold
WE JUSTLOVE PHYSICS!!
8:38 AM
+ EVAPORATION
~ like boiling, evaporation is the change of state from liquid to gas
~ evaporation can take place at any temperature.
©clarice2008
WE JUSTLOVE PHYSICS!!
8:28 AM
