# The temperature difference between gelation and liquefaction temperature of hydrocolloid is:
A. Syneresis
B. Imbibition
C. Hysteresis
D. Chelation
The correct answer is C. Hysteresis.
Most materials melt as well as resolidify at the same temperature. However in agar this does not coincide. Gelation (solidification) occurs at 37°C approximately, whereas liquefaction (melting) occurs at a higher temperature, i.e., 60 to 70°C higher than the gelation temperature. This temperature lag between liquefaction and gelation is known as hysteresis.
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