My Board

Tambayan ng mga Chicx at Tsonx => Body Talks => Foods, Gourmet & Drinks => Topic started by: fayt on June 07, 2013, 02:14:35 PM

Title: Hot water can and frequently does freeze faster than colder water.
Post by: fayt on June 07, 2013, 02:14:35 PM: EXPLANATION: This phenomenon has been discussed for centuries; although, it wasn’t until 1969 that a Tanzanian high school student introduced it to the scientific community. For his troubles, the phenomenon was named the “Mpemba Effect” after the student.

Since then, physicists have verified that hot water often freeze
s more quickly than cold water. Scientists have not been able to definitively explain why this happens, but a few phenomena are thought to contribute to the effect:

Evaporation—Hot water evaporates faster than cold water and brings away steam (water), thereby reducing the amount of liquid to be cooled. Less ice is created, but it is made at a faster rate. This can only be a partial explanation, however, because studies of completely enclosed containers have also exhibited the Mpemba effect.

Convection—As the water cools, its temperature does not remain uniform throughout. The swirling around of the hotter and cooler sections may contribute to faster cooling.

Dissolved Gases—Hot water holds fewer amounts of dissolved gases than cold water. These gases may prevent convection or change the temperature necessary to freeze the liquid.

Container and Surroundings—The container in which the water is held, as well as the surface or the surroundings in which it is placed, may also affect the cooling process differently at different temperatures.

Interesting fact: Many ice cream makers use warm milk to take advantage of the Mpemba effect.

credit to source

(http://sphotos-d.ak.fbcdn.net/hphotos-ak-ash4/p480x480/419111_575089029181026_2043139869_n.jpg)
Title: Re: Hot water can and frequently does freeze faster than colder water.
Post by: trafficjam on August 20, 2013, 02:27:02 PM: im. i have never heard or read about this. thanks for the info!
Title: Re: Hot water can and frequently does freeze faster than colder water.
Post by: ¿m☺ÿ on August 20, 2013, 07:11:16 PM: hmnn.. interesting ito.. thanks for sharing sir.
:-\
Title: Re: Hot water can and frequently does freeze faster than colder water.
Post by: Pinoymasterp on August 20, 2013, 08:37:40 PM: i wanna try this sometime. good post sir
Title: Re: Hot water can and frequently does freeze faster than colder water.
Post by: fayt on August 20, 2013, 10:44:30 PM: Quote from: trafficjam on August 20, 2013, 02:27:02 PM
im. i have never heard or read about this. thanks for the info!

welcome po sir... salamat po sa pagbisita dito...
Title: Re: Hot water can and frequently does freeze faster than colder water.
Post by: fayt on August 20, 2013, 10:44:47 PM: Quote from: imoy on August 20, 2013, 07:11:16 PM
hmnn.. interesting ito.. thanks for sharing sir.
:-\

welcome po sir salamat po sa pagbisita dito sa thread
Title: Re: Hot water can and frequently does freeze faster than colder water.
Post by: fayt on August 20, 2013, 10:45:07 PM: Quote from: Pinoymasterp on August 20, 2013, 08:37:40 PM
i wanna try this sometime. good post sir

cge sir try nyo po and feedback nyo kami dito kung ano nanyare hehehe