Does the temperature of the water being heated affect the time it takes for it to boil?

Question

My professor once told me that the lower the temperature of the water being heated, the faster it takes for it to boil unlike the ones with the higher temperature, i just want to know ALL the reasons behind it.. :D

Answer 1

Yes it does, the colder it is, the longer it takes the for the water to boil.
However, warm water does freeze faster than cold water under some conditions and here's an explanation for it. /http://www.worsleyschool.net/science/files/freezing/water2.html

Answer 2

I haven't heard this, but here is my take on it (and why it doesn't make sense to me):

If you have water at 211 degrees F, (1 degree below boiling) and you turn up the heat, how long is it going to take to boil? Not very long, in fact, at that temperature some of it will already be boiling.

If you have an ice cube in the pan, it will take MUCH longer to reach the boiling point.

Perhaps there is some difference in the time it takes with temperatures that are closer together, or maybe this is true for temperatures a certain amount away from the boiling point ... ?

Answer 3

This is a loaded question. According to Newton, the rate at which heat will flow from a warm body to a cold body depends on the difference in temperature between the bodies - of course, the bigger the difference the faster heat flows. That is why the closer they get in temperature as the cooler body is heated by the warmer body, the slower is the exchange of heat. However, this is a realtive phenomenon.
Another thing to keep in mind, which is probably what your professor is refering to, is that the greater the difference between the two bodies in temperature (ie one of them is water), the more energy is needed altogether, to raise the temperature of the cooler body to that of the warmer body. Is the temperature of the warmer body constant? If so, then energy will continue to flow into the cooler body to a point - and the rate at which the energy can flow is presumably limited. So, the farther it has to go the longer it takes. That's probably what your professor meant.
The ACTUAL rate depends on several factors such as the characteristics of the contact media, the actual temperatures, etc. The heat capacity and the heat conductivity do not remain exactly the same across all temperatures, and if you want to be precise, the density is not the same as the temperature changes. There are several other details to keep in mind if you want to determine the ACTUAL rate of heat exchange. If the water is held in a certain type of vessel, and heated by a gas jet, all these things need to be determined first.

Answer 4

Cold water does not boil faster than hot water. The rate of heating of a liquid depends on the magnitude of the temperature difference between the liquid and its surroundings (the flame on the stove, for instance). As a result, cold water will be absorbing heat faster while it is still cold; once it gets up to the temperature of hot water, the heating rate slows down and from there it takes just as long to bring it to a boil as the water that was hot to begin with. Because it takes cold water some time to reach the temperature of hot water, cold water clearly takes longer to boil than hot water does

Answer 5

Colder water when heated will reach a point where it is same as water with higher temperature. From then on the time it takes to boil the water will be the same.
All conditions being equal, the colder water will take longer time to boil.

Answer 6

your professor is wrong, and in fact scientists that aren't stupid
will tell you the same as I. the cold molecules take more time
to change state than warm molecules, since warm molecules
are half way there already. now if you change barametric pressure or elevation or place that water in a vaccum then the
science really starts to show it self. water boils at 212 degrees
at sea level if you go to denver , which is at 5000 ft above sea
level that temperature will lessen, thus you could boil water at
say 180 degrees. also if you take water and put it in a vaccum,
you can boil water at room temperature, that's right kids i said
you can boil water at 72 degrees or any other crazy temp, if you
put a strong enough vaccum on it.

your truth giving champ ALPHAMOD2001

Answer 7

Take one glass of water at room temperature and another same quantiy of cold water from you fridge.

Start heating them using similar vessels simultaneouly; find out which one boils quickly.

Check your statement whether it is correct or not.

When your professor was telling about temperature, you just began to sleep and when he was telling about pressure you just woke up and the "temperature was lingering in your ears".

Answer 8

yes it does the colder water will boil faster than the warm

Answer 9

Low temperatures meaning colder. I don't think what you're professor told you is correct, maybe it's the reverse which is true. But I'm not sure about his also...

Answer 10

So, you are actually admitting to everyone here that you can not boil water? Well, I admit, you sure picked a round-about way of saying it. I give you a thumbs up for that! ;-P