Explain how the meanings of the following terms differ.
petroleum gas and natural gas

Explanation

To explain the differences between petroleum gas and natural gas, we can break down the characteristics of each term step by step.

### Step-by-Step Solution:

1. **Definition of Petroleum Gas**:
- Petroleum gas, commonly known as liquefied petroleum gas (LPG), is primarily a mixture of hydrocarbons, mainly propane and butane.
- It is derived from the refining of crude oil and can also be obtained from natural gas processing.

...