0.04% of inhaled air is carbon dioxide. Identify how much carbon dioxide there is in exhaled air.

To determine how much carbon dioxide is present in exhaled air, we can follow these steps:

1. ### Break Down the Problem

We know that inhaled air contains 0.04% carbon dioxide. However, when air is exhaled, the concentration of carbon dioxide increases significantly due to metabolic processes in the body. We need to identify the typical concentration of carbon dioxide in exhaled air, which is generally around 4% to 5%.

2. ### Relevant Concepts

The conversion from inhaled air to exhaled air can be considered based on the concentration change. The concentration change is due to the body's metabolism which produces carbon dioxide.

• Inhaled air CO₂ concentration = 0.04%
• Exhaled air CO₂ concentration (typical) ≈ 4% to 5%

3. ### Analysis and Detail

Given the typical range, let's calculate the average percentage of carbon dioxide in exhaled air:

• Average exhaled CO₂ concentration = (4% + 5%) / 2 = 4.5%

4. ### Verify and Summarize

To summarize, inhaled air has a carbon dioxide concentration of 0.04%, while exhaled air generally has a concentration of about 4.5%. This is a substantial increase due to the metabolic production of carbon dioxide in the body.

Final Answer

The concentration of carbon dioxide in exhaled air is approximately 4.5%.