Which of the following is a function of a gasket in a pipe joint?

A gasket plays a crucial role in ensuring a proper seal between two surfaces in a pipe joint. Its primary function is to prevent leakage of fluids or gases that may be flowing through the pipes. By being compressed between the mating surfaces, a gasket helps to fill any microscopic gaps or irregularities, thus creating a barrier that prevents the passage of fluids. This is essential in maintaining the integrity of the piping system and ensuring safety and efficiency in operations.

While blocking airflow, supporting heavy loads, and connecting two pipes are important aspects of pipe installation and maintenance, they are not the primary purpose of a gasket. A gasket does not inherently block airflow or provide structural support; these functions are typically managed by the design and layout of the piping system itself. Similarly, while gaskets can be part of the assembly connecting pipes, their primary role is focused on sealing to prevent leakage.