Question

what happens to the particles of a substance as its temperature increases?
○ they move faster.
○ they move slower.
○ they lose some energy.
○ they move in a circular direction.

Explanation:

Temperature is a measure of the average kinetic energy of a substance's particles. When temperature increases, the average kinetic energy of the particles rises, causing them to move more quickly. The other options are incorrect: slower movement and energy loss occur with decreasing temperature, and particle motion is not inherently circular with temperature increase.

Answer:

They move faster.