When air is saturated, it cannot hold

Options

A. more water vapour
B. more air
C. more carbon dioxide
D. more oxygen

Answer

To solve the question "When air is saturated, it cannot hold...", we need to understand the concept of saturation in the context of air and water vapor. Here’s a step-by-step solution:

### Step 1: Understand Saturation
Saturation refers to the point at which air contains the maximum amount of water vapor it can hold at a given temperature. Beyond this point, the air cannot accommodate any additional water vapor.

**Hint:** Think about what happens when a sponge is full of water; it cannot absorb any more.

### Step 2: Define Relative Humidity
Relative humidity (RH) is a measure that indicates how much water vapor is present in the air compared to the maximum amount of water vapor the air can hold at that temperature. It is expressed as a percentage.

**Hint:** Remember that RH = (Actual Water Vapor Pressure / Saturated Water Vapor Pressure) × 100%.

### Step 3: Identify the Condition of Saturation
When the relative humidity reaches 100%, it means the air is fully saturated with water vapor. At this point, the air cannot hold any more water vapor.

**Hint:** Consider what 100% means in everyday terms; it indicates a complete state.

### Step 4: Conclude the Answer
Since the question asks what air cannot hold when it is saturated, the answer is that saturated air cannot hold more water vapor.

**Hint:** Focus on the key term "saturated" and what it implies about the air's capacity.

### Final Answer
When air is saturated, it cannot hold **more water vapor**.