DISCRIBE A SINGLE EXPERIMENT TO SHOW THAT EXPIRED AIR CONTAINS WATER

Answer 1

To demonstrate that expired air contains water, we can conduct a simple experiment using a glass jar and a mirror. Here are the steps:

1. Set up the experiment in a well-ventilated area. Make sure there is no direct airflow from fans or air conditioning that can affect the results.
2. Take a clean glass jar with a lid and place it upside down on a flat surface.
3. Clean a small section of the surface of a mirror, ensuring it is completely dry and free of any moisture.
4. Take a deep breath and exhale slowly and steadily into the jar. Avoid touching or exhaling directly onto the mirror.
5. Quickly place the lid on the jar, making sure it is sealed tightly to prevent air from escaping.
6. Leave the sealed jar undisturbed for a few minutes, giving time for any moisture in the exhaled air to accumulate.
7. Carefully remove the lid from the jar without tilting it to avoid any condensation spilling.
8. Now, observe the mirror and see if there is any condensation or water droplets formed on the previously cleaned section.
9. If there are visible water droplets or fogged areas on the mirror, it indicates that expired air contains water.

This experiment works because when we exhale, our breath contains water vapor. As the warm and moist air enters the sealed jar, it cools down, causing the water vapor to condense into liquid water droplets on the mirror's surface. This condensation process demonstrates the presence of water in expired air.