For vaporization to occur, the particle s of the substance must  heat from the environment.

For vaporization to occur, the particles of a substance must absorb heat from the environment. Here are the steps:

1. The substance starts in a solid or liquid state.

2. Heat is applied to the substance. This can come from the environment, such as when heat from the sun causes water to evaporate.

3. The particles of the substance absorb this heat, which gives them energy.

4. As the particles gain energy, they begin to move more rapidly. This increased movement weakens the forces holding the particles together.

5. If enough heat is absorbed, the particles will have enough energy to overcome these forces entirely. At this point, the particles break free and become a gas.

6. This process of a substance changing from a liquid to a gas is called vaporization.

Remember, for vaporization to occur, the substance doesn't necessarily need to boil. It can also happen at temperatures below the boiling point, a process known as evaporation.