Condensation happens when a gas or vapor cools down and becomes liquid.

• A. True
• B. False
• C. It requires pressure increase
• D. It occurs only at high temperatures

Answer: (A)

Condensation is the change of a substance from a gas to a liquid. It happens when energy is removed from the gas—usually by cooling—so the molecules slow down and the attractive forces pull them into a liquid. At the given pressure, cooling the vapor to its dew point makes it condense.

That’s why the statement is true: condensation occurs when a gas or vapor cools down and becomes liquid. Temperature reduction is the common trigger; pressure increase can help under some conditions, but it’s not the defining factor. Condensation also isn’t tied to high temperatures—quite the opposite: it happens as the gas is cooled. Examples include fog forming in air or water droplets on a cold surface.