If the water is initially hot, cooled water at the bottom is denser than the hot water at the top, so no convection will occur and the bottom part will start freezing while the top is still warm. This effect, combined with the evaporation effect, may make hot water freeze faster than cold water in some cases.
Does boiling water freeze faster than cold water?
Hot water freezes faster than cold, known as the Mpemba effect. … The Mpemba effect occurs when two bodies of water with different temperatures are exposed to the same subzero surroundings and the hotter water freezes first.
Does hot water freeze faster than cold water Mythbusters?
Yes — a general explanation. Hot water can in fact freeze faster than cold water for a wide range of experimental conditions. This phenomenon is extremely counterintuitive, and surprising even to most scientists, but it is in fact real.
Does room temp water boil faster than cold water?
Despite the common myth that cold water boils faster than hot, this is actually not true! Cold water does absorb heat faster than hot water, which may be the origin of this myth. However, once cold water reaches the temperature of hot water, its heating rate slows down and it takes just as long to boil.
What freezes faster hot or cold water experiment?
Hot water evaporates at a much faster rate than cold water. This means that the bowl with hot water actually had less water than the bowl with cold water, which helped it freeze more quickly.
At what temperature does boiling water freeze instantly?
This is known as the triple point, and temperatures need to reach 0.01°C (32.018°F) for it to happen, Uttal explains. When you boil water, you’re adding energy to water in its liquid state.
Does hot water freeze faster than cold water independent variable?
It’s an age-old question with a simple answer: no. When the temperature of the water in each container reaches just about 0°C it will undergo the same changes as it moves from a liquid to a solid, and it will take the same amount of time to begin forming tiny ice crystals. …
Why does boiling water freeze clear?
The short answer: Cloudy ice is caused by gases (mainly nitrogen and oxygen) dissolved in the water that come out of solution when the water freezes. The small bubbles trapped in the ice cause the white appearance. Boiling the water removes the air dissolved in it, producing clear ice as a result.
Which water freezes faster saltwater or freshwater?
Which freezes faster, water or salt water? Answer 1: While pure water freezes at 0°C (32°F), salt water needs to be colder before it freezes and so it usually takes longer to freeze. The more salt in the water, the lower the freezing point.
Why does hot water freeze faster than cold Quora?
Mpemba Effect is caused by molecule(in this question water) structure. hot water have enough space to get stuck( means being ice) but cold one need some more time to have enough space to get stuck. because of this, hot one is freeze faster than cold one. in contrast, boil means molecules apart each other.
Why is it better to use cold water to boil?
There is, however, a good reason to use cold water instead of hot for cooking: hot water will contain more dissolved minerals from your pipes, which can give your food an off-flavor, particularly if you reduce the water a lot. Water that’s been frozen or previously boiled will boil faster.
What temperature does water freeze at?
The Mpemba effect is the observation that warm water freezes more quickly than cold water. … Hence the faster freezing. Another is that warm water evaporates rapidly and since this is an endothermic process, it cools the water making it freeze more quickly.
Can I use hot water to boil faster?
Truth: Hot water boils faster.
But it might heat faster if it starts higher. If you’re in a hurry, turn your tap to the hottest setting, and fill your pot with that hot tap water. It’ll reach boiling a bit faster than cold or lukewarm water. You can also get the water even hotter by using your electric kettle.
Does water freeze faster in metal or plastic?
Metals are good conductors of heat, so water can freeze faster than in a plastic ice tray.