To: Everyone in 5Courage (including Mr Wan)
Hi everyone! I am sorry for not being able 2 post up d science notes as my computer cannot upload the software. The pictures i've taken is still with me. I would want 2 noe who can help me 2 upload the images using a handfone and i'll send you the images via bluetooth. Please approach me if you can do so......
Thanks!
Samantha
11 October 2009
Apology....
Posted by lmao at 12:18 PM
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3 comments:
No problem.
It's mainly about molecules in matter.
The higher the number of molecules, the larger the mass, the more heat energy it has.
Heat transfer comes in 3 forms. (Only conduction is in syllabus)
Conduction is heat travel between two objects, usually solids.
Convection refers to movement of heat current in air and water. Take note that hot air rises and cold air sinks. Hot water current will rise to the top while colder water sinks to the bottom. That's why the sea gets colder as it gets deeper.
Radiation refers to heat from a heat source. If an object is transparent, infra-red light can pass through. So transparent object radiates more heat. Black object radiates heat as well. Heat transfers in a vacuum through radiation. (vacuum flask and the sun)
The main things you need to know about heat are:
All matter conducts heat.
Matter expands when heated.
Heat travels faster on metal, usually an electrical conductor.
Heat travels from a warmer place to a colder place.
Heat transfer takes place between 2 bodies until both bodies are of the same temperature.
I'm sorry I also can't do it...I can't find my sony erricson thumbdrive to upload the pics...sorry
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