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220 °c [13] 428 °F ^ Specified smoke, fire, and flash points of any fat and oil can be misleading: they depend almost entirely upon the free fatty acid content, which increases during storage or use.
Converting units of temperature differences (also referred to as temperature deltas) is not the same as converting absolute temperature values, and different formulae must be used. To convert a delta temperature from degrees Fahrenheit to degrees Celsius, the formula is {Δ T } °F = 9 / 5 {Δ T } °C .
Because liquid droplets commonly exist in clouds at sub-zero temperatures, 0 °C is better defined as the melting point of ice. In this scale, a temperature difference of 1 degree Celsius is the same as a 1 kelvin increment, but the scale is offset by the temperature at which ice melts (273.15 K).
[2]: 31 [4] At some point, the quarter degrees became whole degrees and Fahrenheit made other adjustments to Rømer's scale, modifying the freezing point from 7.5 degrees to 8, which, when multiplied by four, correlates to 32 degrees on Fahrenheit's scale [3]: 73 The 22.5 degree point would have become 90 degrees, however, Fahrenheit rounded ...
Low-temperature cooking is a cooking technique that uses temperatures in the range of about 60 to 90 °C (140 to 194 °F) [1] for a prolonged time to cook food. Low-temperature cooking methods include sous vide cooking, slow cooking using a slow cooker, cooking in a normal oven which has a minimal setting of about 70 °C (158 °F), and using a combi steamer providing exact temperature control.
It is a medium-high to high heat cooking process. Temperatures between 160–190 °C (320–374 °F) are typical, but shallow frying may be performed at temperatures as low as 150 °C (302 °F) for a longer period of time. [1] The high heat promotes protein denaturation-browning and, in some cases, a Maillard reaction.
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More accurate measurements become important in the large volumes used in commercial food production. Also, a home cook can use greater precision at times. Water at 4.0 °C (39.2 °F) may be volumetrically measured then weighed to determine an unknown measuring-utensil volume [13] without the need for a water-density adjustment. [14]