Question

1. Water can be changed from one state to another by ______ or ________.

• A. Cooling
• B. Heating

Answer 1

• Water exists in three phases i.e. solid, liquid, and gas.
• Ice represents the solid phase, water represents the liquid phase, and steam (water vapor) represents the gaseous phase.
• Ice is converted into water by heating. This process is known as melting.
• Water is converted into water vapor by heating. This process is known as vaporization
• Water vapor is converted into water by cooling. This process is known as condensation.
• water is converted into ice by cooling. This process is known as freezing.
• Hence, water can be changed from one state to another by cooling or heating.