http://www.youtube.com/watch?v=K-GSrrk_ATM
Can you explain this?
There seems to have been an argument whether it is evaporation, condensation or sublimation....
http://www.youtube.com/watch?v=K-GSrrk_ATM
Can you explain this?
There seems to have been an argument whether it is evaporation, condensation or sublimation....
Simple sir, its not rocket science, it'sOriginally Posted by FellMonster
youtube
Hills and Guinness!
Ahhhh, but Im looking for a scientific explanation as to the process which is happening sir......a hot liquid appears to be turning into a gas which is leading people to think it is evaporation.
However, is it turning into gas or small ice particles? Evaporation normally takes place at positive temperatures. Though when evaporation takes place there also condensation occuring also but usually at less significant rate.
Sublimation on the other hand is a solid turning into a gas at negative temperatures....but this is not a solid, it is hot water
Anyone?
Is this thread a joke? Or is it about Dr Who?
It's actually a special thread for two reasons:
1) It operates under the auspice of asking for clarification on a serious scientific issue.
2) Deep within the ancients word I use are hidden secret messages of healing and love for mankind
Technically speaking it is freezing. The hot water is liquid, at this temperature it turns to ice, which is solid. Therefore liquid --> solid is freezing or solidification. It is a slight 'optical illusion' in that it looks as if it is evaoprating.Ahhhh, but Im looking for a scientific explanation as to the process which is happening sir......a hot liquid appears to be turning into a gas which is leading people to think it is evaporation.
However, is it turning into gas or small ice particles? Evaporation normally takes place at positive temperatures. Though when evaporation takes place there also condensation occuring also but usually at less significant rate.
Sublimation on the other hand is a solid turning into a gas at negative temperatures....but this is not a solid, it is hot water
Anyone?
The comment about negative or positive temperature is technically incorrect, changes of state occur due to a negative or positive enthalpy change (roughly speaking energy)
This is how I would explain it at school. I hope that it is clear, if it comes across as condescending, my apologies....
PS this clip could make a great starter in alesson, thank you!!
1) I think I've kind of attempted
2) I'm a science teacher, I don't claim to be anything else apart from a slow fell runner...
That is more helpful than you may ever know sir.....it didn't come across as condens-ing at allTechnically speaking it is freezing. The hot water is liquid, at this temperature it turns to ice, which is solid. Therefore liquid --> solid is freezing or solidification. It is a slight 'optical illusion' in that it looks as if it is evaoprating.
The comment about negative or positive temperature is technically incorrect, changes of state occur due to a negative or positive enthalpy change (roughly speaking energy)
This is how I would explain it at school. I hope that it is clear, if it comes across as condescending, my apologies....
PS this clip could make a great starter in alesson, thank you!!
the clip will certainly arouse interest id imagine.
I was about to say that...Technically speaking it is freezing. The hot water is liquid, at this temperature it turns to ice, which is solid. Therefore liquid --> solid is freezing or solidification. It is a slight 'optical illusion' in that it looks as if it is evaoprating.
The comment about negative or positive temperature is technically incorrect, changes of state occur due to a negative or positive enthalpy change (roughly speaking energy)
This is how I would explain it at school. I hope that it is clear, if it comes across as condescending, my apologies....
PS this clip could make a great starter in alesson, thank you!!
Feck!!! Beat me tuitI was about to say that...
Hills and Guinness!
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