Answer:
By adding heat energy It became a gas Explanation:The molecules moving about another is a clear indicator that the substance is a liquid. In a liquid, the molecules stick together and move about one another. When the scientist increase the speed of the of substance, the kinetic energy increases. if this increase causes a phase change, then the substance becomes a gas. So, by adding heat energy a substance becomes gaseous if it is a liquid already.
Step-by-step explanation: