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In the process of directional solidification, weight always remains constant for all the materials.

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in Casting-Forming-Welding I by (687k points)
In the process of directional solidification, weight always remains constant for all the materials.

(a) True

(b) False

The question was asked in an interview.

My question is taken from Directional Solidification in chapter Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

1 Answer

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by (828k points)
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Right choice is (b) False

The explanation: According to the conservation of mass, weight remains constant until occurring of any reaction in the process. So, in some cases of materials, weight loss can occur by evaporation when the vapour pressure is very high. For example, vapour pressure of chromium is relatively high, about ten times the vapour pressure of silicon at the processing temperatures.

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