Which term describes internal voids in a material?

Which term describes internal voids in a material?

• A. Shrinkage cavity
• B. Pores
• C. Stress
• D. Lattice

Answer: (B)

Internal voids in a material are called pores. Pores are empty spaces that exist inside a solid and can be open to the surface or completely enclosed. They form for various reasons, such as during solidification, casting, processing, or service conditions, and they are a general manifestation of porosity. A shrinkage cavity is a specific type of void that arises when the molten material doesn’t feed the shrinking volume during solidification; it’s still a porosity defect, but the broader term for internal voids is pores. Stress is the internal force per unit area within a material, and lattice is the orderly arrangement of atoms in a crystal structure, not voids.

Internal voids in a material are called pores. Pores are empty spaces that exist inside a solid and can be open to the surface or completely enclosed. They form for various reasons, such as during solidification, casting, processing, or service conditions, and they are a general manifestation of porosity. A shrinkage cavity is a specific type of void that arises when the molten material doesn’t feed the shrinking volume during solidification; it’s still a porosity defect, but the broader term for internal voids is pores. Stress is the internal force per unit area within a material, and lattice is the orderly arrangement of atoms in a crystal structure, not voids.