What is another example of a gas in your classroom? I know air would be one but I can't think of what would be another one present in a classroom.
Thanks...
In a typical classroom, aside from air, another example of a gas that might be present is carbon dioxide (CO2). Here's how you can understand and recognize its presence:
1. Observe respiration: When humans and animals breathe, they inhale oxygen (O2) and exhale carbon dioxide as a waste product. Therefore, the presence of people or animals in the classroom will contribute to the accumulation of carbon dioxide.
2. Consider combustion processes: If you use Bunsen burners, alcohol burners, or other sources of flames in the classroom during experiments, these processes produce carbon dioxide as a byproduct.
3. Evaluate potential sources: Certain laboratory chemicals or substances used for experiments could release carbon dioxide gas. For example, the reaction between an acid (such as vinegar) and a base (like baking soda) produces carbon dioxide gas.
4. Use a carbon dioxide detector: If you want a definitive answer, you can use a carbon dioxide detector or a data logger. These instruments measure the concentration of carbon dioxide in the air and can help identify its presence.
Remember, it's important to ensure proper ventilation in classrooms to maintain a healthy concentration of gases, including carbon dioxide.
http://www.google.com/#q=gases+air
Also carbon dioxide
http://dictionary.reference.com/browse/carbon+dioxide