Yes. Air moves into the top bottle to replace the volume of water that has flowed into the bottom.
your experiment would be to state the problem,make an hypothesis,research,analyze,experiment,then comes your conclusion
"They were doing an experiment" is past tense.
Fill one empty bottle partway with water, take a second, identical empty bottle and connect it neck-to neck with the other bottle. The are special connectors for doing this, but duct tape can work if you don't have one as long as you hold on to that part. Once they are connected turn the whole thing upside down and briefly shake it in a circular motion. A "tornado" should form in a couple seconds.
the purpose of doing an experiment is to discover new things
Doing duplicates means doing the experiment / process two times. Doing triplicates means doing the experiment / process three times.
dependent variable
When doing a controlled experiment, you get accurate results.
It depends, if you are doing an experiment on temperatures of water in nature, you will need it. If you are doing an experiment on how fast different species of turtles can walk, you don't.
Because it will perform a test of how two variables might be related. This is when you are doing a real experiment.
In gymnastics you will need to have an experiment for gymnastics when you are doing a research
An excellent experiment is one when you know what you want to find out and you do research on it to expand your knowledge of what you want to gain from doing the experiment. By doing this you are more likely to have an excellent experiment.
it means you made a mistake