Perfume sprayed from a bottle spreads more easily in a warm room of 25°C than in a cool room of 15°C. Which of the following correctly compares perfume molecules at 25°C to those at 15°C?
At 25°C, they have more mass. At 25°C, they are moving faster. At 25°C, they have less kinetic energy. At 25°C, they are decreasing in volume.