Question

question 3 of 9
melting is...
when solid loose heat and turns into a liquid state
when solid gains heat and turns into a liquid state
when liquid lose heat and turns into a solid state
when liquid gain heat and turns into a solid state

Explanation:

Melting is a physical process in which a solid gains heat energy. This heat energy causes the particles in the solid to vibrate more vigorously and overcome the forces holding them in a fixed - position (in the solid state). As a result, the solid changes its state to a liquid.

• The first option is incorrect because when a solid loses heat, it would tend to stay as a solid or even become a more "ordered" solid (if it's a pure substance near its freezing point), not melt.
• The third option describes freezing (when a liquid loses heat and turns into a solid).
• The fourth option is incorrect as a liquid gaining heat would tend to vaporize (turn into a gas) rather than turn into a solid.

Answer:

when solid gains heat and turns into a liquid state