Scientist Determines the Perfect Shape for a Cold Beer Glass

The case where mathematics proved to be truly useful.

Brazilian scientist Claudio Pellegrini from the Federal University of São João del-Rei has determined the ideal shape of a beer glass that allows the drink to stay cold longer by minimizing heat exchange with the environment. His approach is based on a mathematical model that considers the impact of the vessel's geometry on the liquid's temperature.

As many beer lovers know, the drink starts to warm up immediately after being poured into a glass. Typically, thermal sleeves are used or handles are added to mugs to reduce contact with the heat of the hands. However, Pellegrini proposed a different method - to change the shape of the glass itself without adding any additional insulating layers.

The researcher suggested that when maintaining a constant temperature and composition of the beer, heat is primarily transferred through the walls of the glass. Ultimately, he found that the best shape for a cold beer glass is a narrow base that expands upwards, similar to classic glasses like tulip-shaped or English pints.

However, this approach has limitations. Optimization of heat transfer is only possible for fixed parameters of the glass, not for a universal set. In other words, the model provides not a precise version of the vessel but a family of similar shapes, complicating the determination of a single ideal size and proportions.

The shape of the glass is also important for creating foam, which retains the molecules responsible for flavor and makes the drink more aromatic. Therefore, some varieties - such as Belgian beers - are served in specially designed glasses that enhance the tasting experience.

Pellegrini also criticized the widely used cheap glasses in Brazil with a volume of only 190 ml, which, according to him, keep the beer cold only because it is consumed quickly. The scientist believes they are unsuitable for other countries, where the capacity is expected to provide not only practicality but also enhance the drink's flavor qualities.