A scientist from Brazil has discovered a mathematical formula for the perfect shape of a glass that can keep beer cold for as long as possible. Claudio de Castro Pellegrini, from the Federal University of San Joooo-Del-Ray, conducted a study with the aim of finding the optimal shape of a glass that minimizes heat transfer between the drink and the surrounding environment.
Research has shown that the ideal shape should reduce the ratio of the glass surface area to its volume, as heat primarily enters through the surface. While a sphere would be the most effective shape in this regard, it is not practical for use in glasses. Pellegrini also considered the dynamics of beer consumption, where the level of fluid in the glass changes, affecting the surface area in contact with air.
Using mathematical models and heat transfer equations, Pellegrini determined that the optimal glass shape resembles that of a champagne glass, with a radius that decreases from a wide neck to a narrow base. This design minimizes heat transfer by reducing the surface area exposed to the surrounding environment.
The scientist adjusted his calculations for popular beer glass types, including imperial and American pints, as well as glasses for wheat beer. While these shapes are not perfect, they do consider consumption habits, where smaller volumes of beer are typically consumed before they have a chance to warm up significantly.