Why in the case of hydrogen and helium, the compressibility factor is always greater than 1 and increases with increase of pressure?

Explanation

To understand why the compressibility factor (Z) for hydrogen and helium is always greater than 1 and increases with pressure, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Definition of Compressibility Factor (Z)**:
- The compressibility factor (Z) is defined as the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure. Mathematically, it is expressed as:
\[
Z = \frac{PV}{nRT}
...