What is meant by aqueous tension ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Aqueous Tension**: Aqueous tension refers to the pressure exerted by water vapor in a mixture of gases. It is specifically the partial pressure of the water vapor present in a moist gas.

2. **Understanding Partial Pressure**: In a mixture of gases, each gas exerts its own pressure, known as partial pressure. The total pressure of the gas mixture is the sum of the partial pressures of all the gases present.

3. **Moist Gas Composition**: When we talk about moist gas, it means that the gas contains water vapor along with other gases. The pressure of this moist gas can be expressed as the sum of the pressure exerted by the dry gas (the gas without water vapor) and the pressure exerted by the water vapor.

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