The Total Expansion of the Investment Is the Sum of the Hygroscopic

question 30

Multiple Choice

The total expansion of the investment is the sum of the hygroscopic and thermal expansions.Investments rely primarily on hygroscopic expansion to compensate for casting shrinkage of the metal.

• A) Both statements are true.
• B) Both statements are false.
• C) The first statement is true; the second statement is false.
• D) The first statement is false; the second statement is true.

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Definitions:

Respiratory Gases

Gases involved in the process of respiration, primarily oxygen (O2) for inhalation and carbon dioxide (CO2) for exhalation.

Spiracles

Small openings on the surface of some animals, such as insects, that allow air to enter and exit the respiratory system.

Tracheal Tubes

Tracheal tubes are part of the respiratory system of certain invertebrates, including insects, providing direct exchange of air through the body.

Countercurrent Exchange

Exchange of substances between two fluids moving in opposite directions.