Expansion and Contraction of Matter
Contraction and expansion of matter occurs everyday around us. We don't observe it enough, but it is happening.
1. Changes in states of matter (freezing, melting, condensation, evaporation, sublimation, boiling) all involves heat transfer.
2. Heat transfer will cause matter to contract or expand. When matter gains heat, it expands. When matter loses heat, it contracts.
3. Matter expands because when it gains heat, its kinetic energy will increase. When kinetic energy increase, it moves faster. When it moves faster, it will move further apart and take up more space.
As shown in class today, these are the videos:
To recap what was shown in the second video, liquid nitrogen is verrrrrrrry cold. Its boiling point is very low, hence it is boiling at room temperature (the temperature of your surrounding in a room). Liquids DOES NOT have to be hot to boil, it will boil when it has enough energy to break the forces of attraction and become a gas (remember the puzzle we did).
If you have any questions, please post a comment.
Cheers.
10:14AM | 13th September 2011
Hi Form 1,
Contraction and expansion of matter occurs everyday around us. We don't observe it enough, but it is happening.
1. Changes in states of matter (freezing, melting, condensation, evaporation, sublimation, boiling) all involves heat transfer.
2. Heat transfer will cause matter to contract or expand. When matter gains heat, it expands. When matter loses heat, it contracts.
3. Matter expands because when it gains heat, its kinetic energy will increase. When kinetic energy increase, it moves faster. When it moves faster, it will move further apart and take up more space.
As shown in class today, these are the videos:
To recap what was shown in the second video, liquid nitrogen is verrrrrrrry cold. Its boiling point is very low, hence it is boiling at room temperature (the temperature of your surrounding in a room). Liquids DOES NOT have to be hot to boil, it will boil when it has enough energy to break the forces of attraction and become a gas (remember the puzzle we did).
If you have any questions, please post a comment.
Cheers.
10:14AM | 13th September 2011
Hi Form 1,
Here's a video about the lesson that we learned today, 25th August.
Review this video and finish up the homework given. Those who have access to internet, please share this video with your friends who have no access to internet. So that they too can do the homework that I have given.
This is a link for some extra information on how heat transfer (click me). Try to understand, if you cant understand, just ask me in the comment/chat box. =)
This is a link for some extra information on how heat transfer (click me). Try to understand, if you cant understand, just ask me in the comment/chat box. =)
Cheers
5:25PM | 25th August 2011
Guys and girls, check out this cool video on density.
10:17PM | 24th July 2011
Hi Form 1, last week I gave you the worksheet about Earth's resources for you to finish at home. We discussed a little about how Earth's resources are being used up at an alarming rate and how we need to recycle and conserve Earth's natural resources.
Watch this video:
8:07PM | 24th July 2011
