Tea kettle question.
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Tea kettle question.
If you put 500 ml of hot water in a tea kettle will it heat to boiling faster than 750 ml of hot water?
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Re: Tea kettle question.
Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
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Re: Tea kettle question.
What is the temperature surrounding the kettle?Zombie Gawdzilla wrote:If you put 500 ml of hot water in a tea kettle will it heat to boiling faster than 750 ml of hot water?

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Re: Tea kettle question.
The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
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Re: Tea kettle question.
Well, it's setting on a burner, so I would say warmish at least.Crumple wrote:What is the temperature surrounding the kettle?Zombie Gawdzilla wrote:If you put 500 ml of hot water in a tea kettle will it heat to boiling faster than 750 ml of hot water?
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Re: Tea kettle question.
The extremes demonstrate the principle. Yes, there is more energy in 750 ml than in 500, but it's distributed throughout a larger volume, too, so water doesn't boil at a certain volume, but at a certain temperature.Zombie Gawdzilla wrote:The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
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Re: Tea kettle question.
The pressure is a important component. The amount of heat require to boil water under pressure is less than that when not under pressure. And the pressure will act on just one surface of the cylinder of water. So although volume is not relavant the shape of the kettle may be? 

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Re: Tea kettle question.
True, but you have to add energy to the mass to increase the temperature. My question is, is there a significant difference in the amount of energy need to boil a mass when the total energy of the mass is higher in one case over another?FBM wrote:The extremes demonstrate the principle. Yes, there is more energy in 750 ml than in 500, but it's distributed throughout a larger volume, too, so water doesn't boil at a certain volume, but at a certain temperature.Zombie Gawdzilla wrote:The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
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Re: Tea kettle question.
Zombie Gawdzilla wrote:The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
More energy released by the 750 ml of water but it will take more energy to heat it


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Re: Tea kettle question.
If you think of the energy present in the water in terms of energy per millilitre, and keep in mind that you need 50% more energy to the boil in a tea kettle containing 750ml of water compared to a kettle containing 500ml, things should become a bit clearer to you.Zombie Gawdzilla wrote:The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
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Re: Tea kettle question.
That's what I'm wondering.Gallstones2 wrote:Zombie Gawdzilla wrote:The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
More energy released by the 750 ml of water but it will take more energy to heat it![]()
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Re: Tea kettle question.
If I understood that, yes.Seraph wrote:If you think of the energy present in the water in terms of energy per millilitre, and keep in mind that you need 50% more energy to the boil in a tea kettle containing 750ml of water compared to a kettle containing 500ml, things should become a bit clearer to you.Zombie Gawdzilla wrote:The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.

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Re: Tea kettle question.
Can you boil an ocean with a cigarette lighter?Zombie Gawdzilla wrote:True, but you have to add energy to the mass to increase the temperature. My question is, is there a significant difference in the amount of energy need to boil a mass when the total energy of the mass is higher in one case over another?FBM wrote:The extremes demonstrate the principle. Yes, there is more energy in 750 ml than in 500, but it's distributed throughout a larger volume, too, so water doesn't boil at a certain volume, but at a certain temperature.Zombie Gawdzilla wrote:The extremes aren't of interest. My thought is there is more "energy" in the 750 than in the 500, so it would take less external heat to bring the 750 to a boil.FBM wrote:Of course, assuming they start at the same temp, have the same rate of heat applied, at the same altitude, yada yada. Just take it to the extremes and see how it works. Take a teaspoon of water and apply that heat, then take a liter of water and apply the same heat. The teaspoonful will be vapor before the liter gets warm.
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Re: Tea kettle question.
Again, you're talking extremes. I'm talking about a closed system with relatively similar amounts of mass to be heated.FBM wrote:Can you boil an ocean with a cigarette lighter?
To restate: Will 500 ml of hot water boil faster than 750 mi of hot water if all else is equal. If you add equal amounts of energy to both you get a higher total quantity of energy in the 750, yes?
Re: Tea kettle question.
What if you don't make tea afterwards, is it still a tea kettle?
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