DisclaimeR
School : Yishun sec :D
We are a class, full of nonsense, awesome, pervertic, crazy & mad people! We are fun to be friends with, fun to make fun off.
But when it comes to serious business, we get serious.
YOU know our names but not our background. Don't EVEN TRY to mess with us :D
We make teachers pissed off easily. Well, ain't that our job? :D
bold underlined
Meet the people
BiologY
Activities
Sec 2 camp
Museum
CIP to neighbourhood
Sandcastle building
Looking for? O.o
Homework
English
Maths
Science
History
Geography
Literature
IPW
CDL
D & T
About us!!
Class rules
Class vision
Class values
Class commitee
Special dates
16 February - Yasmin
20 February - Swee Yi
26 February - Si Ying
14 March - Z.Xue Ting
15 March - Vasanth
15 March - Jennifer
24 March - Shaofeng
4 April - C.Xue Ting
7 April - Darren
14 April - Nicholas
19 April - Haziyah
20 May - Fang Shu
2 June - Bellennium
10 June - YY
11 June - Yong Shun
13 June - Zhi Xiong
14 June - Mr Ang!!!
2 July - Jun Wei
13 July - Zhang Peng
22 July - Xingran
5 September - Wei Long
10 September - Jason
20 September - Amanda
20 September - You Jie
20 September - You Yi
30 September - Janice
1 October - Amirul
4 October - Claudia
11 October - Shawn Lee
25 October - Chris
30 October - Syiqin
26 November - Joan
23 December - Fitri
Bosses
Miss Lei Hong (Co-form teacher)
Mr Stanley Ang (Science teacher)
Miss Suba (English teacher)
Mr Joshua Yeung & Ms Ng (Maths teachers)
Mdm Fan Lijun (Chinese teacher)
Miss Ganda (Malay teacher)
Mr Bala & Mr Simon Tay (D & T teachers)
Mr Selvam (Art teacher)
Miss Kelly Tan (History teacher)
Mr Clarence Lee (Literature teacher)
Miss Dimas (Geography teacher)
Mr Chan & Mr Ng (PE teachers)
Mr Ng (Music teacher)
CommentS
Affiliates
MelodieS
Your music codes here !
Mixpod Recommended !
Wednesday
Convection video given to by AMANDA!
http://www.youtube.com/watch?v=5pG-tkbQgMo
Notes
This are meant for ppl who nvr attend school and missed some notes copying :D
Science notes (Volume B chapter 25 Transmission of heat)
Pg 2: Heat moves!
- Heat is a form of energy that is transmitted from a region of higher to lower temperature.
Pg3: Heat moves!
In 3 ways...
-CONDUCTION
-CONVECTION
-RADIATION
Conduction
- Conduction is transmission of heat through a material from the hot region to the cool region without any visible movement
Pg 4:
Conduction
-Solids are BETTER CONDUCTORS of heat than liquids and gases as solid particles are CLOSER together
- Thus, kinetic energy is transferred MORE QUICKLY in solids..
How Conduction works in solids
- When one end of a rod is heated, particles there GAIN ENERGY and VIBRATE FASTER.
- There particles COLLIDE with less energetic neighbours.
Pg 5:
How conduction works in solids
- Some of their energy is TRANSFERRED TO NEIGHHBOURING PARTICLES which thus gains kinetic energy
- This goes on until the cold end reaches SAME TEMPERATURE as the hot end
Good & Bad Conductors of heat
- Materials conduct heat at DIFFERENT RATES
- GOOD CONDUCTORS of heat allow heat to flow throught RAPIDLY
- Bad conductors or GOOD CONDUCTORS of heat allow CONDUCTORS of heat allow heat to flow through SLOWLY
Pg 6:
Good & bad conductors of heat
| Copper | Air |
| Gold | Styrofoam |
| Aluminium | Body fat |
| Brass | Cork |
| Iron | Water |
| Lead | Glass |
| Stainless steel | |
| | |
|_________________________________|___________________________________|
http://www.youtube.com/watch?v=5pG-tkbQgMo
Notes
This are meant for ppl who nvr attend school and missed some notes copying :D
Science notes (Volume B chapter 25 Transmission of heat)
Pg 2: Heat moves!
- Heat is a form of energy that is transmitted from a region of higher to lower temperature.
Pg3: Heat moves!
In 3 ways...
-CONDUCTION
-CONVECTION
-RADIATION
Conduction
- Conduction is transmission of heat through a material from the hot region to the cool region without any visible movement
Pg 4:
Conduction
-Solids are BETTER CONDUCTORS of heat than liquids and gases as solid particles are CLOSER together
- Thus, kinetic energy is transferred MORE QUICKLY in solids..
How Conduction works in solids
- When one end of a rod is heated, particles there GAIN ENERGY and VIBRATE FASTER.
- There particles COLLIDE with less energetic neighbours.
Pg 5:
How conduction works in solids
- Some of their energy is TRANSFERRED TO NEIGHHBOURING PARTICLES which thus gains kinetic energy
- This goes on until the cold end reaches SAME TEMPERATURE as the hot end
Good & Bad Conductors of heat
- Materials conduct heat at DIFFERENT RATES
- GOOD CONDUCTORS of heat allow heat to flow throught RAPIDLY
- Bad conductors or GOOD CONDUCTORS of heat allow CONDUCTORS of heat allow heat to flow through SLOWLY
Pg 6:
Good & bad conductors of heat
_____________________________________________________________________
| Good conductors | Poor Conductors |
|_________________________________|____________(Insulators)______________|
| Silver | Vacum | | Copper | Air |
| Gold | Styrofoam |
| Aluminium | Body fat |
| Brass | Cork |
| Iron | Water |
| Lead | Glass |
| Stainless steel | |
| | |
|_________________________________|___________________________________|
Application of conduction
1. Uses of good conductors
- Used where heat has to be QUICKLY TRANSMITTED
E.g. Pans, kettles, cooking utensils
- Usually made of metals like Aluminium, copper, steel
Pg 7.
Application of conduction
2. Uses of poor conductors (Insulators)
- Uses where UNWANTED HEAT HAS TO NE KEPT AWAY or to PREVENT HEAT LOSS
E.g. vacum flask, handles of saucepan
- Made of CLOTH, PLASTICS, WOOD etc.
Application of conduction
(a) Double - glazed window
- TRAPPED AIR between 2 layers of glass is good insulator, REDUCES CONDUCTION of heat
Pg 8
TABLE SHALL SKIP FIRST...
Convection
Convection is the TRANSMISSION OF HEAT through a FLUID (LIQUID OR GAS) from the HOT TO THE COLD region by the CIRCULATING MOVEMENT of the fluid
Pg 9
Convection
- Occurs in FLUIDS (liquid and gases), but not in solids
- When one part of fluid is HEATER, it EXPANDS, becomes LESS DENSE and RISES.
- The surrounding COOLER AND DENSER FLUID SINKS
- Thia produces a circulating movement called CONVECTION CURRENT
Pg 10
Convection in liquids
- Add POTASSIUM PERMAGANATE (purple) crystals into a flask of water.
- HEAT flask gently just below the crystals
- Purple-sreaked water RISES UPWARDS and fan outwards.
- Water becomes EVENLY PURPLE IN COLOUR after a while
Pg 11.
Convection in gases
- Fit two glass chimneys to the top of a wooden box with a plane glass window.
- LIGHT A CANDLE below one chimney
- Heat from this initiates a CONVECTION CURRENT
- HOT AIR FLOWS OUT of this chimney
- COLD AIR FLOWS IN throught other chimney
Pg 12.
Application of convection
1. Sea breeze (Daytime)
- In the day, LAND HEATS UP FASTER than the sea
- Air above land EXPANDS AND RISES
- COOL AIR above sea MOVES IN towards the land
- Thia result in SEA BREEZE.
Pg 13.
Application of convection
2. Land breeze (Night time)
- At night, THE LAND COOLS FASTER than the sea.
- WARM AIR above sea RISES
- COOL AIR above land MOVES OUT towards the sea.
- Result in LAND BREEZE
Pg 8
TABLE SHALL SKIP FIRST...
Convection
Convection is the TRANSMISSION OF HEAT through a FLUID (LIQUID OR GAS) from the HOT TO THE COLD region by the CIRCULATING MOVEMENT of the fluid
Pg 9
Convection
- Occurs in FLUIDS (liquid and gases), but not in solids
- When one part of fluid is HEATER, it EXPANDS, becomes LESS DENSE and RISES.
- The surrounding COOLER AND DENSER FLUID SINKS
- Thia produces a circulating movement called CONVECTION CURRENT
Pg 10
Convection in liquids
- Add POTASSIUM PERMAGANATE (purple) crystals into a flask of water.
- HEAT flask gently just below the crystals
- Purple-sreaked water RISES UPWARDS and fan outwards.
- Water becomes EVENLY PURPLE IN COLOUR after a while
Pg 11.
Convection in gases
- Fit two glass chimneys to the top of a wooden box with a plane glass window.
- LIGHT A CANDLE below one chimney
- Heat from this initiates a CONVECTION CURRENT
- HOT AIR FLOWS OUT of this chimney
- COLD AIR FLOWS IN throught other chimney
Pg 12.
Application of convection
1. Sea breeze (Daytime)
- In the day, LAND HEATS UP FASTER than the sea
- Air above land EXPANDS AND RISES
- COOL AIR above sea MOVES IN towards the land
- Thia result in SEA BREEZE.
Pg 13.
Application of convection
2. Land breeze (Night time)
- At night, THE LAND COOLS FASTER than the sea.
- WARM AIR above sea RISES
- COOL AIR above land MOVES OUT towards the sea.
- Result in LAND BREEZE
Labels: Science
Yours Truly , 2E6 ! (:♥ @ 2/09/2011 08:28:00 PM