DISCRIBE A SINGLE EXPERIMENT TO SHOW THAT EXPIRED AIR CONTAINS WATER
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.
To demonstrate that expired air contains water, you can conduct a simple experiment using a glass and your breath. Here's how you can perform it:
Materials needed:
1. A clean glass or jar
2. Ice cubes
3. Paper towel or napkin
Procedure:
1. Begin by ensuring that the glass or jar is clean and dry.
2. Take a few ice cubes and place them inside the glass. This will cool the glass and facilitate the condensation of water vapor.
3. Wait for a few minutes to allow the glass to reach a lower temperature.
4. Now, take a deep breath and exhale slowly and evenly into the glass, avoiding any saliva or spit from entering.
5. Immediately after exhaling, cover the mouth of the glass with a piece of paper towel or napkin.
6. Let the glass sit undisturbed for a few minutes, allowing for condensation to occur.
7. After some time, carefully remove the paper towel or napkin and observe the inside of the glass.
Explanation:
When you exhale, the warm air coming from your lungs contains water vapor. This warm air gets cooled down by the ice cubes present in the glass. As a result, the water vapor present in the exhaled air slowly condenses on the inner surface of the glass. This condensation makes the water vapor visible in the form of tiny water droplets on the glass. The appearance of these droplets demonstrates that expired air contains water.
Alternatively, you can enhance the visibility of the condensation by shining a flashlight or a lamp towards the glass from a different angle. This will allow you to see the condensation more clearly.
It's important to note that the amount of water vapor present in expired air may vary depending on factors such as temperature and humidity. Conducting this experiment in a controlled environment or repeating it multiple times may yield more consistent results.
To demonstrate that expired air contains water, you can conduct a simple experiment using a glass or bottle and a mirror. Here are the step-by-step instructions:
1. Gather the materials needed for the experiment: a glass or bottle, a small mirror, and a source of expired air such as your mouth.
2. Fill the glass or bottle with cold water.
3. Place the mirror securely on the top of the glass or bottle, ensuring that it covers the open end completely.
4. Wait for a few minutes to allow the mirror to acclimate to the room temperature.
5. Take a deep breath and exhale slowly into the glass or bottle, directing your breath onto the mirror surface.
6. Observe the mirror immediately after exhaling onto it.
7. You will notice that a thin layer of moisture or condensation appears on the mirror surface. This condensation is evidence of water content in the expired air.
8. Repeat the process a few times to obtain consistent results.
By conducting this experiment, you will be able to visually demonstrate that expired air contains water, as the moisture from your breath condenses on the mirror due to the cooler surface temperature.