Experiment to show that expired air contain water
Place a piece of glass in the fridge until it is cooled. Remove from the fridge, exhale onto the cool glass. Observe the droplets of water that have condensed on the cooled glass suface. You want to do this on a day when the humidity is low. This is not exactly a fool proof experiment but it is quick, easy, simple. To guard against humidity of the air condensing on the cool glass you can place a glass or plastic straw, preferably a colorless one, in the fridge and when removed from the fridge blow slowly into the tube and observe the droplets of water on the inside of the tube. With continued blowing droplets of water will drip from the end of the tube that isn't in the mouth.
To conduct an experiment that demonstrates that expired air contains water, you can follow these steps:
Materials:
1. Glass or transparent container with a lid
2. Ice cubes
3. Hot water
4. A cloth
Procedure:
1. Begin by filling the glass container with hot water, leaving some space at the top.
2. Close the container tightly with the lid to trap the warm air inside.
3. Let the container sit for a few minutes to build up moisture.
4. Take the container and open it briefly, exhaling a breath of air into it.
5. Quickly close the container again to prevent the escape of the expired air.
6. Now, place ice cubes on top of the container's lid, covering it completely.
7. Wait for a few minutes, allowing the warm air inside the container to cool down.
8. After waiting, remove the ice cubes, and you will notice condensation on the inside of the container.
9. The condensation is evidence that the expired air you exhaled contained water vapor.
Explanation:
When you exhale, the air you release contains moisture in the form of water vapor. This is because the air you inhale contains some humidity, and your lungs also add moisture through the process of respiration. When hot air, carrying this moisture, is trapped inside the container, it forms water vapor as it cools down. The contact of the warm air with the cold surface of the container's lid causes the water vapor to condense, forming droplets on the inside of the lid.
This experiment visually demonstrates that expired air contains water, and when the warm air inside the container cools down, the water vapor turns into visible water droplets, indicating the presence of water in the exhaled breath.
Sure! Here is a step-by-step experiment to demonstrate that expired air contains water:
Materials:
1. Empty glass
2. Plastic wrap or cling film
3. Rubber band
4. Ice cubes
Procedure:
1. Fill the empty glass with room temperature water.
2. Cover the glass with plastic wrap and secure it with a rubber band, making sure it is airtight.
3. Place a few ice cubes on top of the plastic wrap.
4. Leave the glass undisturbed for a few minutes to allow the air inside the glass to cool down.
5. After a few minutes, observe the outside surface of the glass and the plastic wrap.
Explanation:
When we exhale, the air we breathe out contains water vapor. In this experiment, the exhaled air from our breath inside the glass cools down when the ice cubes are placed on top. As the air cools, the water vapor present in the air condenses and forms tiny droplets. These droplets are visible on the outside surface of the glass and the plastic wrap, showing that expired air contains water.
Note: It is important to ensure that the glass is airtight to prevent any external air from entering and affecting the results of the experiment.