Which material undergoes hysteresis ?
Correct answer: B. Reversible hydrocolloid
- A. Irreversible hydrocolloid
- B. Reversible hydrocolloid
- C. Impression plaster
- D. Metallic oxide paste
Explanation
Reversible hydrocolloid, mainly agar, shows hysteresis because its liquefaction temperature is higher than its gelation temperature. This temperature difference allows agar to be liquefied by heating and gelled by cooling.
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