Which term refers to a flexible material used to seal gaps between surfaces?

The correct term for a flexible material used to seal gaps between surfaces is caulking. Caulking is specifically designed to fill joints and cracks, preventing air and moisture from entering or escaping. It is commonly used in construction and home improvement projects to ensure a tight seal around windows, doors, and other areas where two surfaces meet. The flexibility of caulking allows it to accommodate movement between materials, such as expansion and contraction due to temperature changes, making it an ideal choice for sealing applications.

Other terms provided, such as cement, refer to a more rigid substance used for binding materials together, but it does not have the flexibility required for sealing gaps. A chalk line is a tool used in marking long, straight lines on flat surfaces. Chase typically refers to a narrow groove or channel cut into a surface for running electrical wiring or plumbing, not a sealing material. Understanding the specific role and properties of caulking reinforces its appropriate use in various projects, highlighting its importance in achieving effective sealing solutions.