For a substance more internal energy is observed in [ same quantity ]

Options

A. Solid state
B. Liquid state
C. Gaseous state
D. All have same

Answer

To solve the question regarding which state of matter has more internal energy, we can analyze the internal energy associated with solids, liquids, and gases step by step.

### Step-by-Step Solution:

1. **Understanding Internal Energy**:
- Internal energy refers to the total energy contained within a substance, which includes both kinetic and potential energy of the particles. It is influenced by the arrangement and motion of the particles.

**Hint**: Recall that internal energy is related to the motion and arrangement of particles in a substance.

2. **States of Matter**:
- The three primary states of matter are solid, liquid, and gas. Each state has distinct characteristics regarding particle arrangement and energy.

**Hint**: Think about how particles are arranged and how they move in each state of matter.

3. **Solid State**:
- In solids, particles are tightly packed in a fixed structure. They have limited movement, primarily vibrating in place. This results in lower internal energy compared to liquids and gases.

**Hint**: Consider how tightly packed particles in solids affect their movement and energy.

4. **Liquid State**:
- In liquids, particles are still close together but can move past one another. This allows for more freedom of movement compared to solids, leading to a moderate level of internal energy.

**Hint**: Reflect on how the increased movement in liquids compared to solids contributes to their internal energy.

5. **Gaseous State**:
- In gases, particles are far apart and move freely at high speeds. This high degree of randomness and kinetic energy results in the highest internal energy among the three states of matter.

**Hint**: Think about how the freedom of movement and spacing between particles in gases contribute to their internal energy.

6. **Conclusion**:
- Based on the analysis, the state of matter with the most internal energy is the gaseous state. Therefore, for a substance, more internal energy is observed in the gaseous state compared to the solid and liquid states.

**Final Answer**: For a substance, more internal energy is observed in the gaseous state.