Which statement explains the molecular changes that occur in an enclosed gas as the pressure increases and the temperature is held constant? 1. An increase in pressure causes particles to move closer together, increasing the volume.
2. An increase in pressure causes particles to move closer together, decreasing the volume.
3. An increase in pressure causes particles to move farther apart, increasing the volume.
4. An increase in pressure causes particles to move farther apart, decreasing the volume.