why hot water change to ice sooner than cold water in cold weather?

Question

in compare when you want to change water to ice hot water change to ice sooner than cold water

Answer 1

Hot water freezes faster than cold water because the act of heating it forces the air bubbles from it. Air freezes slower than water, so water-air mixture freezes slower than plain water.

Fill a sink with the hottest water the faucet can product. It starts out sort of milky-looking, slightly opaque. Watch it for a few minutes and it clears as the air bubbles rise to the surface and leave.

Try it again with cold water. Starts out clear and the air bubbles never leave, remaining mixed.

Answer 2

Let's get this straight. We are talking about two identical sealed containers of water standing side by side with the same amount of water in them.

If one container has water that has been boiled, and the other is cold tap water, and they are the same temperature to start with, the previously boiled water will cool down faster than the tap water. This is because air in the tap water slows the rate of cooling.

But - if one container has warm water, and one has cold water, the cold water freezes first. No contest. Thermometers in the two containers will show the hot water cooling at a faster rate than the cold water, but it will not get to freezing first.

If the containers are unsealed, some hot water can evaporate at the start, leaving less water to cool and maybe that will freeze first.

So why do hot water pipes tend to burst before cold water pipes when they freeze. As a test you could turn off your furnace in the middle of winter until the pipes burst, but I wouldn’t suggest that you do - (but if you must know first hand, please conduct this experiment - then feel free to email me your results). And yes, it is true that hot water pipes tend to (notice the "tend to" which means not in all cases) burst before the cold water pipes and here is why. Previously heated water (which has driven out some air bubbles) forms denser ice than water which contains more air bubbles. And because solid (frozen) H2O occupies more volume than its liquid form, it can burst pipes - and the denser the ice, the larger the volume, which gives it a slightly better chance of busting a pipe first.

Answer 3

How could hot water freeze without being cold water first? It's not possible.

The air bubbles in hot water behave differently from the air bubbles in cold water, so it may look different frozen or during the freezing process.

Answer 4

While it may seem fair that you can stop paying your rent until your landlord makes the repairs, it will put YOU in breach of the contract and give him cause to evict you and sue you. Read your lease. It should spell out everything you and the landlord are responsible for. If you are renting without one, contact an attorney or legal-aide or the housing authority in your town. Buy or rent a safe heater in the mean-time. If your landlord was negligent in failing to respond to your heating problems he should also have to reimburse you the heater's cost.

Answer 5

When you are cooling the hot water,the rate of cooling is faster till it attains the room tempeature. After that both will cool at the same rate.

Answer 6

Myth! IT doesn't.

Answer 7

It doesn't?