Supercooling of Water
Place ml of distilled water into the flask, Evacuate the flask and keep it under vacuum until the second cooling stage. 3. Place the flask into an acetone bath and cool the flask to around 1°C by adding dry ice to the acetone. 4. Sep 18, · In order to form ice, the water needs a nucleation site – a small spot where the first ice crystal can begin. Once an ice crystal forms, the rest of the water will freeze fairly quickly. The undisturbed bottles of water you left in the freezer for several hours became super-cooled.
In order to form ice, the water needs a nucleation site — a small spot where the first ice crystal can begin. Once an ice crystal jow, the rest of the water will freeze fairly quickly. The undisturbed bottles of water you left in the freezer for several hours became super-cooled. Once you opened the bottle and exposed the very cold water to a solid piece of ice, the water froze instantly!
The ice cube provided a supercooeld site for the first drop of water to freeze, and from there what is the zip code for maple grove minnesota was sort of like a chain reaction, where more and more water froze on top of it, creating a slushy ice sculpture in your bowl.
What do you think would happen to the pure water in the bottles if you left them in the freezer for longer? Would they eventually freeze solid or stay liquid? Learn more about solids and liquids with this science lesson for kids, and experiment with frozen bubbles! Super-Cooled Water Science Project. Close the freezer door and set a timer for 2 hours. After 2 hours, check on the bottles to see if ice has formed inside any. Repeat for 15 more minutes if necessary. While you wait for the water to finish cooling, put a few small chunks of ice in a bowl and set out your larger bowl and glasses on the counter.
Very carefully remove one of the bottles from the freezer and set it on the counter. If you take them all out at once, they will begin to qater up slightly and the results of the experiments will not be as impressive.
Set one ice cube in the large bowl and very carefully remove the cap from the chilled bottle of water. Slowly pour the water into the bowl, directly on the ice cube. It should begin to freeze and pile up on top of the ice as soon as it touches it! Now try pouring some of the water into a glass. Does anything happen? What happens to the chilled water if you drop a small chunk of ice into it?
Pour some water into another glass and hold an ice cube in the how to use a jump rope for a second. What happens? The ice in the glass should freeze around supercoo,ed ice cube, holding it in place!
Disappearing Styrofoam Cup. Circuit Science Projects.
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A liquid can be taken to a temperature below its freezing point if it is cooled slowly and there are no nucleation sites for crystallization to begin. The only specialized piece of apparatus is the flask itself figure 1. The housing for the temperature probe is a 3mm bore glass tube whose end has been blown into a bulb.
This bulb is filled with mercury for good thermal contact. The outside surface of the bulb also needs to be smooth, so give it the HF treatment too. The side spout of the flask has attached a short length of rubber hose, then a valve that links up to a vacuum pump.
It is best to support the probe using a clamp stand otherwise the flask will be top heavy and you'll put a lot of strain on the glass tube. The flask preparation is as follows: 1.
Place ml of distilled water into the flask, Evacuate the flask and keep it under vacuum until the second cooling stage. Transfer the flask to a salted ice-water bath. During this period of cooling, which can take up to an hour, ensure that the bath has a fresh supply of ice and salt, and remove excess water. The vacuum can be gradually released from the flask at this stage; this will result in an increase in temperature and the possible drawing in of impurities. The water should cool to around The setup for the actual demonstration is illustrated in figure 2.
Carefully remove the bung and temperature probe and transfer the flask to a tripod. It should sit on a plate of glass and a piece of Polaroid material that are cut to fit the tripod platform. Mounted about 50cm above the flask is a light box fronted with Polaroid material, held in position with lab clamps and rods so it shines down onto the flask. The setup allows light to pass through the water which is now between two crossed Polaroids; this shows the crystal growth in beautiful color.
Use the Canon CCD camera with 10mm lens to look up through the base of the flask. To initiate crystallization, use tweezers to drop a CO 2 crystal into the water. Flask at time of cooling figure 2. The demonstration setup. Legend has it that there are some lakes in Switzerland that are supercooled, and that casting a stone into the water will instantly freeze the lake. After the hassle of supercooling pure water in an ultra-clean ultra-smooth flask, Mother Nature knows something we don't.
We are sure the preparation can be simplified, but at this time we've had no success with any elements of the cooling process changed. Frustration is the name of the game, and ultimately, you'll get more out of it than the audience. Complete key to listings.
Skip to main content. Main Menu Utility Menu Search. Browse Catalog. Pure water cooled to below K without freezing; seeded to spontaneously crystallize. What it shows: A liquid can be taken to a temperature below its freezing point if it is cooled slowly and there are no nucleation sites for crystallization to begin. How it works: This is pretty much described in Setting it Up.
Setting it up: The only specialized piece of apparatus is the flask itself figure 1. The demonstration setup Comments: Legend has it that there are some lakes in Switzerland that are supercooled, and that casting a stone into the water will instantly freeze the lake.
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