Water powder ratio of dental stone and plaster is respectively_________________?
Correct answer: D. 0.28 and 0.6
- A. 0.28 and 0.98
- B. 0.6 and 0.28
- C. 0.6 and 3.2
- D. 0.28 and 0.6
Explanation
Dental stone needs much less water than plaster because its particles are denser and more regularly shaped; typical values are about 0.28 for stone and approximately 0.45 to 0.60 for plaster. Thus the listed pair matches the commonly used approximate values.
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