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The thickness of a slip cast layer increases approximately with

  • A.the cube of the total elapsed casting time
  • B.the square root of the casting time
  • C.the square of the elapsed casting time
  • D.the casting time directly and in proportion

Answer: B

The growing cast itself resists the flow of water, so each additional millimetre takes longer than the one before. Doubling the thickness therefore requires roughly four times the time. The relationship is derived from Darcy flow through the growing cast.

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