EVERYDAY SCIENCE

Detailed explanation-1: -So what is a phase change? A phase change is the process of a substance gaining or losing energy so that molecules or atoms either come closer together or become farther apart. When a solid gains enough energy, it becomes a liquid. When a liquid gains enough energy, it becomes a gas.

Detailed explanation-2: -When water absorbs enough heat, it becomes a gas (water vapor). This process is called evaporation. Water vapor (steam) mixes with the air and seems to disappear. A simple example is water boiling in a teapot and escaping into the air.

Detailed explanation-3: -We can change a solid into a liquid or gas by changing its temperature. This is known as changing its state. Water is a liquid at room temperature, but becomes a solid (called ice) if it is cooled down. The same water turns into a gas (called water vapor) if it is heated up.

Detailed explanation-4: -Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down.

Detailed explanation-5: -Evaporation occurs when a liquid changes to a gas. During evaporation, molecules gain enough thermal energy to escape from the liquid surface into the air as water vapor.