Question

Soda and other carbonated beverages seem more "fizzy" when they are served on an airplane at standard cruising altitude. Write a hypothesis that could explain this observation

Answer 1

If the pressure in the air around a carbonated beverage decreases, then the beverage will seem more fizzy because more gas can come out of the liquid

Step-by-step explanation:

Answer 2

Carbonated beverages have CO2 dissolved in them under pressure. As this pressure is released or reduced, then this gas can dissipate and thus cause fizziness as it escapes from the drink. At a standard cruising altitude, which would presumably be quite high, the air pressure is less than at sea level so the gas can escape easier than at a lower elevation where the air pressure is higher.