Oklahoma Pit and Fissure Sealants State Practice Exam

What phenomenon can occur when mixing two liquids together in sealant application?

1. Evaporation of solvents

2. Formation of bubbles

3. Increased viscosity

4. Solidification

The correct answer is: Formation of bubbles

When two liquids are mixed together during sealant application, the phenomenon of bubble formation can occur due to various reasons. As the liquids combine, air can become trapped in the mixture, leading to the creation of bubbles. This is especially common in sealants where the mixing process introduces air, or if one of the components releases gas during the reaction. The presence of bubbles can affect the sealant’s efficacy by creating voids which can compromise the seal's integrity and effectiveness in protecting the underlying surfaces. Understanding this phenomenon is important for ensuring a proper application, as bubbles might need to be minimized or removed to achieve a successful seal. In contrast, while other phenomena like evaporation of solvents, increased viscosity, and solidification are relevant to the process of mixing sealants, they do not directly relate to the immediate mixing and the introduction of air into the mixture. Evaporation pertains to the loss of solvent after mixing, increased viscosity involves changes in the consistency of the mixture, and solidification refers to the sealant transitioning into a solid state after application, none of which directly capture the immediate outcome of mixing two liquids that might lead to bubbles.