- Why do hot water pipes freeze first?
- Is ice hot or cold?
- How long does it take cold water to freeze?
- Does hot water freeze faster than cold water Mythbusters?
- Why does boiled water freeze faster?
- Does ice boil faster than water?
- Is it safe to drink water that’s been frozen in plastic bottle?
- Is mpemba effect real?
- Does hot water freeze clearer than cold water?
- Does freezing hot water make clear ice?
- How do you super freeze water?
- What freezes faster cold or hot water?
- Does salt water freeze faster?
- Does hot water kill germs?
- Can salt water freeze?
- What can freeze water instantly?
- Why is it better to use cold water to boil?
Why do hot water pipes freeze first?
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..
Is ice hot or cold?
Most students (and many adults too) think that the hand feels cold because the “cold” from the ice is penetrating the skin. Actually, the hand feels cold because the heat from your hand is leaving your skin and moving into the ice. This is why the ice melts.
How long does it take cold water to freeze?
It takes about 3 to 4 hours for a standard ice cube tray of water to freeze. This is in a standard freezer with a temperature of 0° F (-18° C). If you fill-up the 12 or so spaces in the ice tray with water at room temperature, and place it in the freezer, it will take from three to four hours before the water freezes.
Does hot water freeze faster than cold water Mythbusters?
The Mpemba effect is a process in which hot water can freeze faster than cold water. The phenomenon is temperature-dependent.
Why does boiled water freeze faster?
One explanation of the effect is that as the hot water cools, it loses mass to evaporation. With less mass, the liquid has to lose less heat to cool, and so it cools faster. With this explanation, the hot water freezes first, but only because there’s less of it to freeze.
Does ice boil faster than water?
“Cold water does not boil faster than hot water. … 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.
Is it safe to drink water that’s been frozen in plastic bottle?
Drinking water from plastic water bottles that freeze or overheat does not increase your risk of cancer. … But there is no evidence that plastic water bottles contain dioxins. Some plastics contain substances known as plasticizers, such as DEHA, to make the plastic more flexible and less brittle.
Is mpemba effect real?
Abstract. The Mpemba effect is the name given to the assertion that it is quicker to cool water to a given temperature when the initial temperature is higher. … We conclude, somewhat sadly, that there is no evidence to support meaningful observations of the Mpemba effect.
Does hot water freeze clearer than cold water?
Conclusion: Hot water does not freeze significantly clearer than cold water, even when the vessel is covered to reduce oxygen re-absorption. In all of these ice experiments so far, the major cloudy factor in the ice has not been cloudiness throughout the ice, but a cloudy spot in the center of the ice.
Does freezing hot water make clear ice?
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.
How do you super freeze water?
The simplest way to supercool water is to chill it in the freezer.Place an unopened bottle of distilled or purified water (e.g., created by reverse osmosis) in the freezer. … Allow the bottle of water to chill, undisturbed, for about 2-1/2 hours. … Carefully remove the supercooled water from the freezer.More items…•
What freezes faster cold or hot water?
Hot water freezes faster than cold, known as the Mpemba effect. … Evaporation is the strongest candidate to explain the Mpemba effect. As hot water placed in an open container begins to cool, the overall mass decreases as some of the water evaporates. With less water to freeze, the process can take less time.
Does salt water freeze faster?
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.
Does hot water kill germs?
Hot water kills germs, though it has to be very hot According to WHO, temperatures of 140°F to 150°F are enough to kill most viruses, and boiling water makes it safe from pathogens like bacteria, viruses, and protozoa.
Can salt water freeze?
Ocean water freezes just like freshwater, but at lower temperatures. Fresh water freezes at 32 degrees Fahrenheit but seawater freezes at about 28.4 degrees Fahrenheit , because of the salt in it. When seawater freezes, however, the ice contains very little salt because only the water part freezes.
What can freeze water instantly?
This method of instant freezing is called “supercooling.” You can use salt, ice, and water to supercool water bottles in an instant. Supercooled water will remain a liquid until something, like a tapping motion, instantly kickstarts the freezing process.
Why is it better to use cold water to boil?
Cold water boils faster than hot water. 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.