What phenomena are observed in the liquid before it starts to boil?

Before the liquid boils, air bubbles appear in it, which grow and rise to its surface. At this time, a noise preceding the boil is heard.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.