A spherical void filled with air or gas. Bubbles form as air is trapped in a liquid. When a plastic cures or hardens, bubbles can form permanent voids that interfere with optical clarity. Sometimes bubbles are purposely injected into a liquid or plastic, such as for the formation of foams.
Sources Checked for Data in Record
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998