The phrase "expose to air" refers to the act of leaving something open to the surrounding atmosphere. However, there are a variety of synonyms for this expression that can be used interchangeably depending on the context. Some of these include "uncover," "reveal," "unveil," "unmask," "broadcast," "circulate," and "disclose." All of these phrases suggest that something which was previously hidden or concealed is now being made public or more visible. They can be used in many different settings, from discussing the materials needed to complete a science experiment to describing a journalist's reporting process.