Cold water requires a higher temperature elevation than warm water does, and therefore will take longer to heat to boilinIf you start with hot water there is not enough difference in temperature from top to bottom to create an effective convection loop, because hot stuff only rises while in the presence of cold stuff to rise above. Warm water promotes a slower convection loop and hence will take longer for "ALL OF THE WATER" to hit 212 degrees.
according to scientists, the notion that a body of cold water will reach boiling temperature more quickly than an identical body of hot water under the same parameters is simply false.
This kitchen myth may have started as a way to encourage people to cook with cold water, not hot, which can contain more impurities. It may also have its origins in the fact that cold water generally gains heat more rapidly than water that is already hot, though it will not boil faster.
But under the right circumstances, the reverse phenomenon can occur, and hot water can freeze more quickly than cool water.
THE BOTTOM LINE
Cold water does not boil faster than hot water, but hot water can freeze more quickly than cool water.
hot water because the atoms and the molecules are already moving around which will cause it to boil faster
Hot water does, as the water particles are already partly "excited".
Water must reach 100° C before it will boil. Since hot water is closer to 100° C than cold water is, hot water will boil quicker than cold water goes once you have started to heat it.
Hot water boils faster than cold water because it is closer in temperature to the boiling point. The boiling point of water is 100oC. If we had hot water at 90oC and cold water at 20oC, then the hot one would reach the boiling point of 100oC faster, since it only has 10oC more to go adn less heat needs to be added.ummm... hot water and hot water boil at the same rate...
No, it does not matter whether or not the water is hot. You can put hot water in a pot but it won't boil any faster.
Hot water runs faster than cold water because the molecules in hot water makes it go faster than cold water.
For the water to reach the boiling point you must add heat to it. If it is hot to start with it needs less heat added .
cold water freezes fasterHot freezes faster than cold.Cold water freezes faster.
They dissolve faster in hot water.
Hot water gets frozen faster than cold water dose. I just did the experiment and found that after awhile cold water freezes faster than hot water.
cold water will leak faster
Hot water is evaporated faster.
Molecules move faster in hot water than cold water
It has been proven that hot water freezes faster than cold water.
ummm... hot water and hot water boil at the same rate...
Molecules spread faster in hot water than in cold water. In cold water, molecules are close to each other but in hot water they are loosely connected which makes them to spread faster.
powder dissolve faster in hot water than in cold water
I recommend putting hot water in your kettle and timing it getting to the boil, and repeating with the same volume of cold water. Then have a think about why this happens.
it dissolves faster in hot water
It dessolves faster in hot water.
It sinks faster in hot water than warm or cold
Hot water boils faster because it is already hot.
hot water has faster moving particales than cold water