3. When water is heated, it changes into steam. This process is known as:
Evaporation
Explanation of correct option:
Option (B): Evaporation is the process in which the substance in the liquid state gets converted into vapors. For example, when water is heated, it starts boiling and changes into water vapors.
Explanation of incorrect options:
Option (A): Condensation is the process in which the substance in a vapor state is condensed back into liquid.
Option (C): Freezing is the process in which the substance in the liquid form gets converted into a solid form.
Option (D): Sublimation is the process in which the substance in solid state gets converted into the gaseous state without changing into a liquid state.
Hence, option (B) is the correct answer. When water is heated, it changes into steam. This process is known as evaporation.