1. The problem statement, all variables and given/known data So I have been set a task to design an experiment revolving around a singing wine glass. This is to rub a finger along the rim of the wine glass to produce a tone. At the moment I am considering to do 2 variables, the volume of liquid within the wine glass and the density of the liquid. We are measuring the frequency and seeing what variable changes the frequency the most. Now onto my problem, I am required to do background research behind this topic; however, I currently don't know what to research and my teacher wants a lot of background information that is relevant to the topic. 2. Relevant equations -None that I know of at the moment.- 3. The attempt at a solution I am thinking about doing some research on the glass and how it vibrates to produce the sound and the different densities of the liquids. But, the density would change depending on the day so I can't do much research on it. Any help as to what I can research about this topic is greatly appreciated thanks.