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Temperatures in Food Preparation
A. Freezing: temperature where liquid turns into solid
Different temperature for different foods
Sugar lowers the freezing point
Salt lowers the freezing point more
Need to keep freezers below 32 degrees F or freezing point of water to keep food frozen.
Heat of solidification: heat or energy given off when liquid turns to solid
B. Intermediate temperatures
Lukewarm: approximately body temperature
Scalding: not quite boiling, small bubbles seen on the edge of the pan, but they don't rise to the surface, used to loosen fruit skins
Simmering: range of temperatures just below boiling, small bubbles slowly form and rise to the surface
Blanching: cooking food briefly at simmering temperatures
C. Boiling: rapid agitation of liquid so that liquid turns to steam
temperature depends on food and altitude
foods that dissolve in water, raise the boiling temp examples: salt, sugar / not: gelatin, starch, etc.
If you go up to Mt. Everest you can put your hand in boiling water and not be burned.
Foods take longer to cook at higher altitudes
Pressure cookers cook in shorter time
D.
Frying
Much higher temperatures than water. Examples: Water: 212 degrees F / Fat: 375-500 degrees F
Need to be careful to dry food before putting in hot oil
Thermometers: have different ranges therefore used to measure different things.
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