Why does a lot of water vapour come suddenly after the heat source of boiling water is removed? [duplicate]
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This question already has an answer here:
Why is there more steam after a pot of water *stops* boiling?
3 answers
I have noticed this several times. When I am boiling water, a few seconds before its boiling point, vapours are formed as usual. But if I turn the gas off before boiling, the moment it turns off, I see a lot of vapours being formed all of a sudden from the hot water for a second or two. Can anyone tell me why this happens?
thermodynamics everyday-life water heat-conduction
edited Dec 23 '18 at 0:18
psitae
684526
asked Dec 21 '18 at 7:34
user217702user217702
43424
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marked as duplicate by Jon Custer, Buzz, Kyle Kanos, JMac, ZeroTheHero Dec 27 '18 at 15:00
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
$begingroup$
This question already has an answer here:
Why is there more steam after a pot of water *stops* boiling?
3 answers
I have noticed this several times. When I am boiling water, a few seconds before its boiling point, vapours are formed as usual. But if I turn the gas off before boiling, the moment it turns off, I see a lot of vapours being formed all of a sudden from the hot water for a second or two. Can anyone tell me why this happens?
thermodynamics everyday-life water heat-conduction
edited Dec 23 '18 at 0:18
psitae
684526
asked Dec 21 '18 at 7:34
user217702user217702
43424
$endgroup$
marked as duplicate by Jon Custer, Buzz, Kyle Kanos, JMac, ZeroTheHero Dec 27 '18 at 15:00
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
$begingroup$
This question already has an answer here:
Why is there more steam after a pot of water *stops* boiling?
3 answers
I have noticed this several times. When I am boiling water, a few seconds before its boiling point, vapours are formed as usual. But if I turn the gas off before boiling, the moment it turns off, I see a lot of vapours being formed all of a sudden from the hot water for a second or two. Can anyone tell me why this happens?
thermodynamics everyday-life water heat-conduction
edited Dec 23 '18 at 0:18
psitae
684526
asked Dec 21 '18 at 7:34
user217702user217702
43424
$endgroup$
This question already has an answer here:
Why is there more steam after a pot of water *stops* boiling?
3 answers
I have noticed this several times. When I am boiling water, a few seconds before its boiling point, vapours are formed as usual. But if I turn the gas off before boiling, the moment it turns off, I see a lot of vapours being formed all of a sudden from the hot water for a second or two. Can anyone tell me why this happens?
This question already has an answer here:
Why is there more steam after a pot of water *stops* boiling?
3 answers
thermodynamics everyday-life water heat-conduction
thermodynamics everyday-life water heat-conduction
edited Dec 23 '18 at 0:18
psitae
684526
asked Dec 21 '18 at 7:34
user217702user217702
43424
edited Dec 23 '18 at 0:18
psitae
684526
asked Dec 21 '18 at 7:34
user217702user217702
43424
edited Dec 23 '18 at 0:18
psitae
684526
edited Dec 23 '18 at 0:18
psitae
684526
edited Dec 23 '18 at 0:18
psitae
684526
684526
asked Dec 21 '18 at 7:34
user217702user217702
43424
asked Dec 21 '18 at 7:34
user217702user217702
43424
asked Dec 21 '18 at 7:34
user217702user217702
43424
43424
marked as duplicate by Jon Custer, Buzz, Kyle Kanos, JMac, ZeroTheHero Dec 27 '18 at 15:00
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by Jon Custer, Buzz, Kyle Kanos, JMac, ZeroTheHero Dec 27 '18 at 15:00
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
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What you are seeing is not actually vapor - vapor is invisible. The mist seen above boiling water, commonly but inaccurately called vapor, is actually made of tiny droplets of liquid water, formed when the vapor cools down and condenses.
While the stove is on, the constant influx of vapor from the boiling water keeps the air above it hot, so condensation is minimal and there is little visible mist. When the gas is turned off, boiling stops, the air above the water cools down, and the vapor it contains suddenly condenses, creating a large plume of mist.
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
$endgroup$
11
$begingroup$
Great answer. I didn't even know what OP was talking about until you explained it. Kudos!
$endgroup$
– user1717828
Dec 21 '18 at 16:22
5
$begingroup$
...and the hot combustion gases from the burner are also hiding the water vapor until the stove is off.
$endgroup$
– elliot svensson
Dec 21 '18 at 20:53
1
$begingroup$
That's a great explanation. This also cleared my misconceptions about vapour. Thanks!
$endgroup$
– user217702
Dec 22 '18 at 6:09
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@user217702 If you consider this to be the right answer you should mark it as such.
$endgroup$
– Aaron Stevens
Dec 23 '18 at 13:16
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John Rennie's answer complements this one by considering the water vapour generated by combustion. I have not noticed the effect described by the OP with my electric burner. Curious.
$endgroup$
– xxyzzy
Dec 26 '18 at 13:35
add a comment |
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Without seeing your experiment we can only speculate, but my guess is that this is due to the convection currents generated by the combustion of the gas.
When the gas is burning there is a large volume of hot carbon dioxide and water vapour generated by the combustion, and this flows upwards and around the pan. This has two effects. Firstly it keeps the temperatures high around and above the pan, so it hinders condensation of the water vapour. Secondly the flow rapidly carries away and condensed water droplets that do form. As soon as you turn off the gas these two effects cease so there is more rapid formation of condensed water droplets.
You might be interested in reading Amount of Steam Generated using Gas burner and Induction cooker as I think this is related to your question.
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
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1
$begingroup$
I've also observed the described phenomenon on my stove which is electric and thus doesn't have an combusting gasses. This seems to imply that there is at least something else at play.
$endgroup$
– Sriotchilism O'Zaic
Dec 22 '18 at 14:31
add a comment |
$begingroup$
Hotter steam has a diffraction index closer to air than steam which is cooler. As the steam cools the droplets get larger, increasing the diffraction making it appear like there is more, when in fact there is less.
Put another way, hot steam scatters light less than cool steam.
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
$endgroup$
add a comment |
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
What you are seeing is not actually vapor - vapor is invisible. The mist seen above boiling water, commonly but inaccurately called vapor, is actually made of tiny droplets of liquid water, formed when the vapor cools down and condenses.
While the stove is on, the constant influx of vapor from the boiling water keeps the air above it hot, so condensation is minimal and there is little visible mist. When the gas is turned off, boiling stops, the air above the water cools down, and the vapor it contains suddenly condenses, creating a large plume of mist.
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
$endgroup$
11
$begingroup$
Great answer. I didn't even know what OP was talking about until you explained it. Kudos!
$endgroup$
– user1717828
Dec 21 '18 at 16:22
5
$begingroup$
...and the hot combustion gases from the burner are also hiding the water vapor until the stove is off.
$endgroup$
– elliot svensson
Dec 21 '18 at 20:53
1
$begingroup$
That's a great explanation. This also cleared my misconceptions about vapour. Thanks!
$endgroup$
– user217702
Dec 22 '18 at 6:09
$begingroup$
@user217702 If you consider this to be the right answer you should mark it as such.
$endgroup$
– Aaron Stevens
Dec 23 '18 at 13:16
$begingroup$
John Rennie's answer complements this one by considering the water vapour generated by combustion. I have not noticed the effect described by the OP with my electric burner. Curious.
$endgroup$
– xxyzzy
Dec 26 '18 at 13:35
add a comment |
$begingroup$
What you are seeing is not actually vapor - vapor is invisible. The mist seen above boiling water, commonly but inaccurately called vapor, is actually made of tiny droplets of liquid water, formed when the vapor cools down and condenses.
While the stove is on, the constant influx of vapor from the boiling water keeps the air above it hot, so condensation is minimal and there is little visible mist. When the gas is turned off, boiling stops, the air above the water cools down, and the vapor it contains suddenly condenses, creating a large plume of mist.
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
$endgroup$
11
$begingroup$
Great answer. I didn't even know what OP was talking about until you explained it. Kudos!
$endgroup$
– user1717828
Dec 21 '18 at 16:22
5
$begingroup$
...and the hot combustion gases from the burner are also hiding the water vapor until the stove is off.
$endgroup$
– elliot svensson
Dec 21 '18 at 20:53
1
$begingroup$
That's a great explanation. This also cleared my misconceptions about vapour. Thanks!
$endgroup$
– user217702
Dec 22 '18 at 6:09
$begingroup$
@user217702 If you consider this to be the right answer you should mark it as such.
$endgroup$
– Aaron Stevens
Dec 23 '18 at 13:16
$begingroup$
John Rennie's answer complements this one by considering the water vapour generated by combustion. I have not noticed the effect described by the OP with my electric burner. Curious.
$endgroup$
– xxyzzy
Dec 26 '18 at 13:35
add a comment |
$begingroup$
What you are seeing is not actually vapor - vapor is invisible. The mist seen above boiling water, commonly but inaccurately called vapor, is actually made of tiny droplets of liquid water, formed when the vapor cools down and condenses.
While the stove is on, the constant influx of vapor from the boiling water keeps the air above it hot, so condensation is minimal and there is little visible mist. When the gas is turned off, boiling stops, the air above the water cools down, and the vapor it contains suddenly condenses, creating a large plume of mist.
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
$endgroup$
What you are seeing is not actually vapor - vapor is invisible. The mist seen above boiling water, commonly but inaccurately called vapor, is actually made of tiny droplets of liquid water, formed when the vapor cools down and condenses.
While the stove is on, the constant influx of vapor from the boiling water keeps the air above it hot, so condensation is minimal and there is little visible mist. When the gas is turned off, boiling stops, the air above the water cools down, and the vapor it contains suddenly condenses, creating a large plume of mist.
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
edited Dec 21 '18 at 10:59
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
answered Dec 21 '18 at 9:53
AetolAetol
1,316116
1,316116
11
$begingroup$
Great answer. I didn't even know what OP was talking about until you explained it. Kudos!
$endgroup$
– user1717828
Dec 21 '18 at 16:22
5
$begingroup$
...and the hot combustion gases from the burner are also hiding the water vapor until the stove is off.
$endgroup$
– elliot svensson
Dec 21 '18 at 20:53
1
$begingroup$
That's a great explanation. This also cleared my misconceptions about vapour. Thanks!
$endgroup$
– user217702
Dec 22 '18 at 6:09
$begingroup$
@user217702 If you consider this to be the right answer you should mark it as such.
$endgroup$
– Aaron Stevens
Dec 23 '18 at 13:16
$begingroup$
John Rennie's answer complements this one by considering the water vapour generated by combustion. I have not noticed the effect described by the OP with my electric burner. Curious.
$endgroup$
– xxyzzy
Dec 26 '18 at 13:35
add a comment |
11
$begingroup$
Great answer. I didn't even know what OP was talking about until you explained it. Kudos!
$endgroup$
– user1717828
Dec 21 '18 at 16:22
5
$begingroup$
...and the hot combustion gases from the burner are also hiding the water vapor until the stove is off.
$endgroup$
– elliot svensson
Dec 21 '18 at 20:53
1
$begingroup$
That's a great explanation. This also cleared my misconceptions about vapour. Thanks!
$endgroup$
– user217702
Dec 22 '18 at 6:09
$begingroup$
@user217702 If you consider this to be the right answer you should mark it as such.
$endgroup$
– Aaron Stevens
Dec 23 '18 at 13:16
$begingroup$
John Rennie's answer complements this one by considering the water vapour generated by combustion. I have not noticed the effect described by the OP with my electric burner. Curious.
$endgroup$
– xxyzzy
Dec 26 '18 at 13:35
11
11
$begingroup$
Great answer. I didn't even know what OP was talking about until you explained it. Kudos!
$endgroup$
– user1717828
Dec 21 '18 at 16:22
$begingroup$
Great answer. I didn't even know what OP was talking about until you explained it. Kudos!
$endgroup$
– user1717828
Dec 21 '18 at 16:22
5
5
$begingroup$
...and the hot combustion gases from the burner are also hiding the water vapor until the stove is off.
$endgroup$
– elliot svensson
Dec 21 '18 at 20:53
$begingroup$
...and the hot combustion gases from the burner are also hiding the water vapor until the stove is off.
$endgroup$
– elliot svensson
Dec 21 '18 at 20:53
1
1
$begingroup$
That's a great explanation. This also cleared my misconceptions about vapour. Thanks!
$endgroup$
– user217702
Dec 22 '18 at 6:09
$begingroup$
That's a great explanation. This also cleared my misconceptions about vapour. Thanks!
$endgroup$
– user217702
Dec 22 '18 at 6:09
$begingroup$
@user217702 If you consider this to be the right answer you should mark it as such.
$endgroup$
– Aaron Stevens
Dec 23 '18 at 13:16
$begingroup$
@user217702 If you consider this to be the right answer you should mark it as such.
$endgroup$
– Aaron Stevens
Dec 23 '18 at 13:16
$begingroup$
John Rennie's answer complements this one by considering the water vapour generated by combustion. I have not noticed the effect described by the OP with my electric burner. Curious.
$endgroup$
– xxyzzy
Dec 26 '18 at 13:35
$begingroup$
John Rennie's answer complements this one by considering the water vapour generated by combustion. I have not noticed the effect described by the OP with my electric burner. Curious.
$endgroup$
– xxyzzy
Dec 26 '18 at 13:35
add a comment |
$begingroup$
Without seeing your experiment we can only speculate, but my guess is that this is due to the convection currents generated by the combustion of the gas.
When the gas is burning there is a large volume of hot carbon dioxide and water vapour generated by the combustion, and this flows upwards and around the pan. This has two effects. Firstly it keeps the temperatures high around and above the pan, so it hinders condensation of the water vapour. Secondly the flow rapidly carries away and condensed water droplets that do form. As soon as you turn off the gas these two effects cease so there is more rapid formation of condensed water droplets.
You might be interested in reading Amount of Steam Generated using Gas burner and Induction cooker as I think this is related to your question.
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
$endgroup$
1
$begingroup$
I've also observed the described phenomenon on my stove which is electric and thus doesn't have an combusting gasses. This seems to imply that there is at least something else at play.
$endgroup$
– Sriotchilism O'Zaic
Dec 22 '18 at 14:31
add a comment |
$begingroup$
Without seeing your experiment we can only speculate, but my guess is that this is due to the convection currents generated by the combustion of the gas.
When the gas is burning there is a large volume of hot carbon dioxide and water vapour generated by the combustion, and this flows upwards and around the pan. This has two effects. Firstly it keeps the temperatures high around and above the pan, so it hinders condensation of the water vapour. Secondly the flow rapidly carries away and condensed water droplets that do form. As soon as you turn off the gas these two effects cease so there is more rapid formation of condensed water droplets.
You might be interested in reading Amount of Steam Generated using Gas burner and Induction cooker as I think this is related to your question.
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
$endgroup$
1
$begingroup$
I've also observed the described phenomenon on my stove which is electric and thus doesn't have an combusting gasses. This seems to imply that there is at least something else at play.
$endgroup$
– Sriotchilism O'Zaic
Dec 22 '18 at 14:31
add a comment |
$begingroup$
Without seeing your experiment we can only speculate, but my guess is that this is due to the convection currents generated by the combustion of the gas.
When the gas is burning there is a large volume of hot carbon dioxide and water vapour generated by the combustion, and this flows upwards and around the pan. This has two effects. Firstly it keeps the temperatures high around and above the pan, so it hinders condensation of the water vapour. Secondly the flow rapidly carries away and condensed water droplets that do form. As soon as you turn off the gas these two effects cease so there is more rapid formation of condensed water droplets.
You might be interested in reading Amount of Steam Generated using Gas burner and Induction cooker as I think this is related to your question.
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
$endgroup$
Without seeing your experiment we can only speculate, but my guess is that this is due to the convection currents generated by the combustion of the gas.
When the gas is burning there is a large volume of hot carbon dioxide and water vapour generated by the combustion, and this flows upwards and around the pan. This has two effects. Firstly it keeps the temperatures high around and above the pan, so it hinders condensation of the water vapour. Secondly the flow rapidly carries away and condensed water droplets that do form. As soon as you turn off the gas these two effects cease so there is more rapid formation of condensed water droplets.
You might be interested in reading Amount of Steam Generated using Gas burner and Induction cooker as I think this is related to your question.
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
edited Dec 21 '18 at 8:51
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
answered Dec 21 '18 at 8:24
John RennieJohn Rennie
278k44555801
278k44555801
1
$begingroup$
I've also observed the described phenomenon on my stove which is electric and thus doesn't have an combusting gasses. This seems to imply that there is at least something else at play.
$endgroup$
– Sriotchilism O'Zaic
Dec 22 '18 at 14:31
add a comment |
1
$begingroup$
I've also observed the described phenomenon on my stove which is electric and thus doesn't have an combusting gasses. This seems to imply that there is at least something else at play.
$endgroup$
– Sriotchilism O'Zaic
Dec 22 '18 at 14:31
1
1
$begingroup$
I've also observed the described phenomenon on my stove which is electric and thus doesn't have an combusting gasses. This seems to imply that there is at least something else at play.
$endgroup$
– Sriotchilism O'Zaic
Dec 22 '18 at 14:31
$begingroup$
I've also observed the described phenomenon on my stove which is electric and thus doesn't have an combusting gasses. This seems to imply that there is at least something else at play.
$endgroup$
– Sriotchilism O'Zaic
Dec 22 '18 at 14:31
add a comment |
$begingroup$
Hotter steam has a diffraction index closer to air than steam which is cooler. As the steam cools the droplets get larger, increasing the diffraction making it appear like there is more, when in fact there is less.
Put another way, hot steam scatters light less than cool steam.
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
$endgroup$
add a comment |
$begingroup$
Hotter steam has a diffraction index closer to air than steam which is cooler. As the steam cools the droplets get larger, increasing the diffraction making it appear like there is more, when in fact there is less.
Put another way, hot steam scatters light less than cool steam.
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
$endgroup$
add a comment |
$begingroup$
Hotter steam has a diffraction index closer to air than steam which is cooler. As the steam cools the droplets get larger, increasing the diffraction making it appear like there is more, when in fact there is less.
Put another way, hot steam scatters light less than cool steam.
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
$endgroup$
Hotter steam has a diffraction index closer to air than steam which is cooler. As the steam cools the droplets get larger, increasing the diffraction making it appear like there is more, when in fact there is less.
Put another way, hot steam scatters light less than cool steam.
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
answered Dec 21 '18 at 17:13
Anthony BachlerAnthony Bachler
811
811
add a comment |
add a comment |
