posted by amaliyah .
There's a test tube filled with a gas, and you bring a flame to the mouth of the tube. Many things could happen... The flame might get snuffed out and there might be a popping sound... so how can you find the density of that gas in relation to the air around it using the observations about the flame? Thank you!
Hold the test tube with open end on the bottom and closed end on top. A gas more dense than air will "fall out" of the open end and snuff out a flame. A gas lighter than air (less dense than air) will stay in the tube. On the other hand, placing the open end up and the closed end down, a lighter gas, such as hyrogen gas, will move out of the open end and pop when it mixes with oxygen with a flame. A more dense gas, such as CO2, will stay in the tube. If this isn't exactly what you are looking for, please clarify the question or post again to let us know what you don't understand.