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Leo
love: chocolate, pink, blue, green, maths, Soft toy
Hobby: Reading, Chatting on phone, Watching movie, shopping
Fav movie: Wind Struck, Sky of Love, Secret, Money not enough2, kung-Fu Panda Fav books: The wrong boy, ahhh there's too many i can"t rmb
Last Post for Sept....
Thursday, September 4, 2008
| 9:10 AM
Hey, that is all i am going to post...i will stop for now...Hope you find my blog useful in a way or another...i have covered chapt 7,8,9 i guess its time to study hard for our EOY... Do leave a tag when u visit =) bye bye...
Evaporation
| 8:02 AM
Evaporation
(a) Occurs at any tempt
(b) Slow process
(c) take place only on liquid suface
(d) No bubbles formed
(e) Tempt may change
(f) heat energy is supplied by the surrounding
(a) Occurs at any tempt
(b) Slow process
(c) take place only on liquid suface
(d) No bubbles formed
(e) Tempt may change
(f) heat energy is supplied by the surrounding
Boiling & Condensation
| 7:33 AM
Boiling:
a liquid is changed to a gaseous state(water vapour)
Why does the outside of your cold glass have water droplet? Why is the mirror in the shower fogged up after you step out?
Condensation:
(a)reverse f boiling point, from gaseous to liquid state
(b)thermal energy is given out
Melting & Solidification
| 6:50 AM
Melting
(a) a process where solid is changed to liquid state
(b) Melting point of ice is 0ºC
Solidification
(a) reverse of melting, from liquid to solid state
(b) Since the melting point of ice is 0ºC, solidification starts to occur
(c)When solid melts the strong intermolecular bonds needs to be broken, to do so energy is needed. That is why there is no change in the temperature during melting.
(d)When liquid molecule come together & solidfy, intermolecular bonds are formed. THERMAl energy is therefore given out
chapter 9, Internal Energy
| 6:34 AM
(an eg of potential energy, Compressed & stretched)Internal Energy:
-consists of Kinetic & potential energy
Kinetc Energy:
(a)Due to vibration of particles
(b) Higher tempt, more vigorous the particles is
Potential Energy:
(a) Due to the stretching & compressing of the intermolecular bonds as the particles vibrate
(b) Amount of p.e is dependent on this 2 factor the Force & the Distance the particles are apart
Interesting Videos....
| 5:26 AM
Enjoy these Videos
Application of Thermal Energy
| 5:19 AM
Application of Thermal Energy
1.conductors:
Able to withstand high tempt, as heat transfer energy
2.Insulators;
Used in handle,prevent thermal energy from being transfered
radiation
| 4:23 AM
Radiation:
(a)it is the continual emission of infared radiation from the suface of all bodies with or without any medium(even in vacuum)
(b)Dull,black suface can absorb more heat than a shiny, white suface
(c)A larger suface area will emit radiation at a higher rate
(d) Suface Area also play a role in the rate of infrared radiation
(a)it is the continual emission of infared radiation from the suface of all bodies with or without any medium(even in vacuum)
(b)Dull,black suface can absorb more heat than a shiny, white suface
(c)A larger suface area will emit radiation at a higher rate
(d) Suface Area also play a role in the rate of infrared radiation
Convection
| 4:15 AM
Convection:
Transfer of thermal energy by means of currents in a fluid (gas or liquid)
(a) it only occur in fluid and not solid
(b) Convection current is the movement of fluid caused by the change in density at various point of the fluid with the surrounding.
Transfer of thermal energy by means of currents in a fluid (gas or liquid)
(a) it only occur in fluid and not solid
(b) Convection current is the movement of fluid caused by the change in density at various point of the fluid with the surrounding.
Conduction
Wednesday, September 3, 2008
| 7:10 AM
Conduction(Its is the process of thermal energy transfer without any flow of the material medium.)
(a) Different material conduct at
different speed
(b) Conductors conduct faster than Insulator
Conductor: Copper, Sliver, Iron Insulator: glass, plastic, wood
(c) Metal contain free electrons that moves randomly between atoms & molecule (Non-metal does'nt have such electrons)
Chapter 8: transfer of thermal Energy
Tuesday, September 2, 2008
| 1:49 AM
8.1 Transfer of Thermal Energy
•Thermal energy always flows from a region of higher temperature to a region of lower temperature
•Thermal energy is transferred by any of the 3 process:
1. Conduction
2. Convection
3, Radiation
•Thermal energy always flows from a region of higher temperature to a region of lower temperature
•Thermal energy is transferred by any of the 3 process:
1. Conduction
2. Convection
3, Radiation
Brownian Motion
| 12:46 AM
7.1 Brownian Motion
Defination:
It is the random or irregular movement of smoke particles in air.
This only occurs in fluid that is either liquid or gas which is able to flow freely.
Observation:
The big ring plays the role of smoke particles, it is observed to move irregularly,due to the air molecule represented by the small metal balls.
Conclusion:
The irregular movement is due to the continual bombarding by air molecules unevenly on different sides of the smoke particules.
Defination:
It is the random or irregular movement of smoke particles in air.
This only occurs in fluid that is either liquid or gas which is able to flow freely.
Observation:
The big ring plays the role of smoke particles, it is observed to move irregularly,due to the air molecule represented by the small metal balls.
Conclusion:
The irregular movement is due to the continual bombarding by air molecules unevenly on different sides of the smoke particules.