Which statement about VOC evaporation is true according to the material?

Which statement about VOC evaporation is true according to the material?

• A. VOC evaporation occurs only at high temperatures
• B. VOC evaporation occurs only under pressure
• C. VOC evaporation never occurs
• D. VOC evaporation occurs at room temperature

Answer: (D)

Volatile organic compounds tend to escape into the air at everyday temperatures because they have relatively high vapor pressures at room temperature. This means there’s a tendency for molecules to leave the liquid (or surface) and become gas even without added heat. People often notice this as paints, solvents, or gasoline releasing vapors in a room or outdoors simply at ambient conditions. Higher temperatures speed this up, but it doesn’t mean evaporation only happens when it’s hot. So the true statement is that VOC evaporation occurs at room temperature because VOCs are already inclined to enter the gas phase under typical ambient conditions. The idea that evaporation requires high temperatures, or only happens under pressure, isn’t accurate for VOCs, and they do evaporate rather than never doing so.

Volatile organic compounds tend to escape into the air at everyday temperatures because they have relatively high vapor pressures at room temperature. This means there’s a tendency for molecules to leave the liquid (or surface) and become gas even without added heat. People often notice this as paints, solvents, or gasoline releasing vapors in a room or outdoors simply at ambient conditions. Higher temperatures speed this up, but it doesn’t mean evaporation only happens when it’s hot.

So the true statement is that VOC evaporation occurs at room temperature because VOCs are already inclined to enter the gas phase under typical ambient conditions. The idea that evaporation requires high temperatures, or only happens under pressure, isn’t accurate for VOCs, and they do evaporate rather than never doing so.