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#11
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"Ron Natalie" wrote in message . .. And yet at 5000 feet you need to adjust how you bake because of the different boiling point of water. Freezing and boiling are different processes. Freezing is not much affected by pressure. Boiling on the other hand is DEFINED in terms of pressure. It's the point where atmospheric pressure equals the vapor pressure. At 5000' (and altimieter setting 29.92), the boiling point is only 202 degrees The liquid water never can get above the boiling point, so the temperature of the food stays cooler and hence it takes LONGER to cook things that are boiled. However, the reason baking instructions change is only partially the boiling point. In baking the food rises due to leavening (yeast, baking powder, etc...) This process (amount of leavening used, temperatures, etc...) is generally set for sea level pressures. At higher altitudes, these recipes tend to over-rise. Adding addional flour or other adjustments to the recipe compensate for this. Freezing (of water) is affected by pressure, but to raise the freezing point requires rather severe decrease in pressure. Between 0 and 5000 feet the frezing point difference is less than a degree. Hey!! Take it to alt.baking.recipes you guys!! :~) Tom -- I lost the recipe for ice cubes. |
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