setting: a huge pot with NO LID, over the stove fire, and 1 litre of water.
method 1: pour all in and boil, its faster as all water gain heat as soon as the fire is on.
method 2: pour a large part of it in, and when it's about to boil, gradually add the remainder of the water in small portions(meaning you dont add the rest in at once, but over small portions), as small portions boil fast, thus the overall is faster.
method 3: pour a bit in, when its about to boil, add a bit more in, keep doing it till all is poured in, this is the fastest method.
which exactly is the fastest way? again i say, do not be caught up in gritty details like "opening the lid means heat loss", because i'll assume there's no lid to cover it up.
or do all methods wield the same results?
2007-05-31 05:48:49 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science
mario and spider, im sorry i dont need your jokes.
2007-05-31 06:10:30 · update #1
4 explanations, all sounds reasonable. since no one can give an answer with reasonable certainty, i shall put this question to voting in 2 days time :p
2007-05-31 18:01:07 · update #2
method 4: go on top of a mountain and boil the water there. It will boil at a lower temp.
2007-05-31 05:52:27 · answer #1 · answered by Spider 2 · 2⤊ 1⤋
All the methods have to yield the same result.... Look at it this way.... you need to give all the water you have, a definite amount of energy to make it all boil... Assuming there is no loss to other media like air etc, and assuming that the fire burns at a constant rate and hence provides a constant rate of heating.... you would need a definite time to heat all the water and it will remain the same in any way you do the experiment.. (It is important not to leave the container empty at any instant if you are pouring in the water after some of it starts to boil...)
2007-05-31 05:56:50 · answer #2 · answered by Ohil 3 · 1⤊ 0⤋
As the water is heated the temperature rises until you reach 100C. After that there is going to be a loss of energy. The stove is no longer being used to increase the temperature of the water but is being used only to create steam. Also, the higher the temperature of the water the faster heat is lost to the surrounding environment. So, I would say it is better to just put all the water into the pot at one time.
2007-05-31 06:26:25 · answer #3 · answered by Anonymous · 1⤊ 0⤋
Pour all the water in. As it heats up, it the kinetic energy of the molecules start to move faster and the heat will be distributed evenly throught the litre of water. If you pour it in by portions, it will take longer because of temperature differences: hot water mixed with the unheated water will cause the mixture to adopt an in-between temperature, and you have to wait for the new volume of water to heat again, and it just takes longer.
2007-05-31 07:15:25 · answer #4 · answered by mbardis22 2 · 1⤊ 0⤋
method 1: pour all in and boil, its faster as all water gain heat as soon as the fire is on.
Is the fastest. The water needs to gain heat to boil. The water in the pot is gaining heat from the fire. The water that is being held out is not gaining heat.
2007-05-31 05:55:21 · answer #5 · answered by DanE 7 · 2⤊ 1⤋
It takes a specific amount of energy to change the state of any material. It doesn't matter what order things are done in. If the burner is applying a constant amount of heat and the heat lost is constant, the end result will be the same for any of your scenarios.
2007-05-31 05:57:14 · answer #6 · answered by DT 4 · 2⤊ 0⤋
I'll have to lean towards 3. You can heat smaller portions faster than you can one large portion.
2007-05-31 05:56:47 · answer #7 · answered by Cool Nerd At Your Service 4 · 1⤊ 1⤋
All three methods should yield the same result.
2007-05-31 08:53:24 · answer #8 · answered by gatorbait 7 · 1⤊ 0⤋
i think putting it all in will be the fastest.
2007-05-31 05:56:51 · answer #9 · answered by *~*Kayti--Baby*~* 2 · 1⤊ 1⤋
are you that pushed for time
2007-05-31 06:08:28 · answer #10 · answered by mario 3 · 0⤊ 1⤋