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Does the Temperature of Water Affect the Speed it Freezes?

The summary of my project is to find out if different water temperatures will make water freeze faster. Does it freeze quicker using hot or cold water?
by

Tyler Shockley

on 5 February 2013

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Transcript of Does the Temperature of Water Affect the Speed it Freezes?

Mrs. Lisa Willard Tyler Shockley
7th Grade Background Research •Source 1 – Ball, Philip. "Why Does Hot Water Freeze Faster? And Other Cracking Science Mysteries." The Guardian. Guardian News and Media, 28 June 2012. Web. 10 Jan. 2013.

•This effect is called the Mpemba effect. This effect is named after Erasto Mpemba, a Tanzanian schoolboy, who in the 1960s learned that hot liquid froze quicker than cold. Hypothesis - colder water temperature = takes longer to freeze
- warmer water temperature = freezes faster

My research has proven this hypothesis. Background Research •Source 2 – Jeng (Momo), Monwhea. "Can Hot Water Freeze Faster than Cold Water?" Can Hot Water Freeze Faster than Cold Water? Department of Physics, University of California, Nov. 1998. Web. 10 Jan. 2013.

•Evaporation may be one reason hot water freezes faster than cold water. Warmer water will lose some water to evaporation. This reduces the amount that has to freeze. Purpose of Experiment The purpose of my experiment is to determine if water freezes faster using cold water or hot water. This information could be helpful to others in that time can be saved when needing to freeze water fast. Background Research
•Hot water supercools. Cold water does not supercool like hot water. Therefore, hot water freezes faster. Background Research Background Research •Source 5 – Helmenstine, Anne Marie, Ph.D.,, Marie HePh.D. "Can Hot Water Freeze Faster Than Cold Water?" About.com Chemistry. N.p., n.d. Web. 10 Jan. 2013.

•Although hot water most likely will freeze faster than cold water, it does not always happen. It has not been determined why it happens sometimes and sometimes not. Experimental Design Independent Variable: temperature of water

Dependent variable: Speed at which water freezes

Constants: freezer temperature, ice trays used, timer

Controlled variables: Temperature of water, temperature, freezer Materials -2 plastic ice trays
-warm water
-cold water
-freezer
-timer Procedures 1. Fill two separate ice trays. One with warm water (Marked with a W in Sharpie) and one with cold water (Marked with a C in Sharpie).
2. Place both trays side by side on the same shelf in same freezer.
3. Set timer for 10 minute intervals.
4. Check status of water freezing at each interval. Data Analysis Minutes Until Frozen Results As a result of my experiment I learned that hot tap water freezes faster than most cold water. However, not every cube froze quicker as some of the cold water cubes froze quicker. I believe that this happened because those particular cube spaces were not filled completely with water. Conclusions The temperature of water does affect the rate at which it freezes in most cases. However, there are many variables that can affect the outcome. Therefore, it is impossible to say that hot water will freeze faster than cold water 100 percent of the time. Bibliography Works Cited

Source 1: Ball, Philip. "Why Does Hot Water Freeze Faster? And Other Cracking Science Mysteries." The Guardian. Guardian News and Media, 28 June 2012. Web. 10 Jan. 2013.

Source 2: Jeng (Momo), Monwhea. "Can Hot Water Freeze Faster than Cold Water?" Can Hot Water Freeze Faster than Cold Water? Department of Physics, University of California, Nov. 1998. Web. 10 Jan. 2013.

Source 3: "Physical Reality." ThinkQuest. Oracle Foundation, n.d. Web. 10 Jan. 2013

Source 4: Sanders, Laura. "It’s True: Hot Water Really Can Freeze Faster Than Cold Water." Wired.com. Conde Nast Digital, 22 Mar. 0010. Web. 10 Jan. 2013.

Source 5: Helmenstine, Anne Marie Helmenstine, Ph.D.,, Marie HePh.D. "Can Hot Water Freeze Faster Than Cold Water?" About.com Chemistry. N.p., n.d. Web. 10 Jan. 2013. •Source 3 – "Physical Reality." ThinkQuest. Oracle Foundation, n.d. Web. 10 Jan. 2013. •Source 4 – Sanders, Laura. "It’s True: Hot Water Really Can Freeze Faster Than Cold Water." Wired.com. Conde Nast Digital, 22 Mar. 0010. Web. 10 Jan. 2013.

•Prior to Erasto B. Mpemba's discovery that was documented, several others had discovered the Mpemba effct. Others who had also, and previous to Mpemba, noticed this effect were Aristotle, Francis Bacon, and René Descartes. 10mins. 20 mins. 30 mins. 40 mins. 50 mins. Hot water Cold Water Qualitative and Quantitative Data
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