Under high pressure , gas changes to liquid state.

Answer

**Step-by-Step Solution:**

1. **Understanding the States of Matter:**
- Matter exists in three primary states: solid, liquid, and gas. Each state has distinct properties based on the arrangement and movement of its particles.

2. **Characteristics of Gases:**
- In the gas state, particles are widely spaced apart and move freely. This large intermolecular space allows gases to expand and fill their container.

3. **Effect of High Pressure:**
- When high pressure is applied to a gas, the volume of the gas decreases. This is because pressure forces the gas particles closer together, reducing the intermolecular space.

4. **Transition to Liquid State:**
- As the pressure increases and the particles are forced closer together, the attractive forces between the particles become significant enough to overcome their kinetic energy. This results in the gas transitioning to a liquid state.

5. **Final Arrangement of Particles:**
- In the liquid state, particles are still close together but can slide past one another, allowing liquids to flow. The intermolecular space is much smaller compared to that in the gaseous state.

6. **Conclusion:**
- Therefore, under high pressure, a gas can indeed change to a liquid state due to the reduction in intermolecular space and the influence of attractive forces between particles.

---