PSLE 2012 - Science
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Hi ksp,
If possible and if you can still remember, please try to write something about the questions beside the qn number. It will be a little difficult to remember what the question is about now.
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Hi try not create a new thread for this. Pls post your discussions about PSLE science in this thread. Thank you.
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=41455&start=50 -
James Ang:
DS says 'Wah. This answer way better than mine'.
Evaporation of mist takes away heat and causes cooling as heat is required to change the mist from liquid state to water vapour which is gaseous state. By creating mist instead of using only water, the surface area of the water is increased and the greater the exposed surface area, the greater the rate of evaporation.kiasu学生:
ill try
Q: Some buildings use a cooling mist system 2 lower the temperature of the surroinding air. the mist comes out in the form of small water droplets.
Q: How does the cooling mist system help 2 lower the temp of the surrounding air? (2m)
some fans were added 2 the coolinf mist systeem.
Q: how do the fans help in the cooling mist system? (1m)
that should be this pprs killer Q
The use of fans creates wind which is moving air and the presence of wind increases the rate of evaporation and produces a greater cooling effect.
Thanks to you too. -
Diedie…I wrote the surrounding air loses heat to the water droplets which lower the temperature…will I get partial marks?
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BeContented:
DS says 'Wah. This answer way better than mine'.
Evaporation of mist takes away heat and causes cooling as heat is required to change the mist from liquid state to water vapour which is gaseous state. By creating mist instead of using only water, the surface area of the water is increased and the greater the exposed surface area, the greater the rate of evaporation.James Ang:
[quote=\"kiasu学生\"]
ill try
Q: Some buildings use a cooling mist system 2 lower the temperature of the surroinding air. the mist comes out in the form of small water droplets.
Q: How does the cooling mist system help 2 lower the temp of the surrounding air? (2m)
some fans were added 2 the coolinf mist systeem.
Q: how do the fans help in the cooling mist system? (1m)
that should be this pprs killer Q
The use of fans creates wind which is moving air and the presence of wind increases the rate of evaporation and produces a greater cooling effect.
Thanks to you too.[/quote]This type of mist producing fans can be seen at some outdoor coffee shops and cafes especially in hot weather Singapore.
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Kiasukiasuofall:
Diedie...I wrote the surrounding air loses heat to the water droplets which lower the temperature...will I get partial marks?
My ds wrote this too -
Big fish:
DS too.Kiasukiasuofall:
Diedie...I wrote the surrounding air loses heat to the water droplets which lower the temperature...will I get partial marks?
My ds wrote this too
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So hard i almost wanted to commit suicide inside
Still got hcl tmrw
Wishing to be a normal chinese pupil
:imdrowning: :?: -
So hard i almost wanted to commit suicide inside
Still got hcl tmrw
Wishing to be a normal chinese pupil
:imdrowning: :?: -
So hard i almost wanted to commit suicide inside
Still got hcl tmrw
Wishing to be a normal chinese pupil
:imdrowning: :?:
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