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PhytoExtractum Shop: Maeng Da Thai Kratom Leaf Powder

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OfflineSteelcutoats
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Registered: 04/28/11
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Temperature Death Time by PC Explained
    #14438578 - 05/12/11 03:42 AM (12 years, 8 months ago)

Thought other newbies were wondering too.

To explain why water boils at 90C in the mountains and 120C in a pressure cooker, even though the normal boiling point of water is 100C, we have to understand why a liquid boils. By definition, a liquid boils when the vapor pressure of the gas escaping from the liquid is equal to the pressure exerted on the liquid by its surroundings, as shown in the figure below.


The normal boiling point of water is 100oC because this is the temperature at which the vapor pressure of water is 760 mmHg, or 1 atm. Under normal conditions, when the pressure of the atmosphere is approximately 760 mmHg, water boils at 100C. At 10,000 feet above sea level, the pressure of the atmosphere is only 526 mmHg. At these elevations, water boils when its vapor pressure is 526 mmHg, which occurs at a temperature of 90C.

Pressure cookers are equipped with a valve that lets gas escape when the pressure inside the pot exceeds some fixed value. This valve is often set at 15 psi, which means that the water vapor inside the pot must reach a pressure of 2 atm before it can escape. Because water doesn't reach a vapor pressure of 2 atm until the temperature is 120C, it boils in this container at 120C.

http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch14/melting.php


Edited by Steelcutoats (05/12/11 05:47 AM)


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