Equal volumes of all gases under similar conditions of temperataure and pressure contain equal number of molecules. This statement is called………………….. .

Explanation

To solve the question, we need to identify the statement that describes the relationship between the volume of gases and the number of molecules under the same conditions of temperature and pressure.

### Step-by-Step Solution:

1. **Understanding the Statement**: The question states that equal volumes of all gases under similar conditions of temperature and pressure contain an equal number of molecules.

2. **Identifying the Law**: This relationship is a fundamental concept in chemistry and is known as a specific gas law.

...