The formula to be used here is that of density which is shown below
Density = Mass ÷ volume
The <u>density</u> of the rubbing alcohol (also known as isopropyl alcohol) is given in the question as 0.79 g/ml while the <u>volume</u> of same is given as 18.7ml. The mass of this rubbing alcohol is the unknown (which we can derive from the formula given earlier).
Tornadoes form when warm humid air collides with cold dry air. The denser the cold air is pushed over warm air, causing an updraft. As soon as it reaches the ground a tornado is formed.
