Peer-Reviewed Study Confirms Soup Cools Down When Left Out, Research Team Cautions Against 'Premature Conclusions' About Soup Temperature Trajectory
A groundbreaking peer-reviewed study released Thursday by the Institute for Culinary Thermodynamic Research has concluded, after fourteen months of rigorous investigation and a $2.3 million federal grant, that soup left sitting on a countertop will, over time, become less hot than it was when it was first placed there.
The study, titled 'Observed Decline in Mean Bowl Temperature Among Stationary Soup Samples Removed From Active Heat Source: A Longitudinal Cohort Analysis,' tracked 847 bowls of soup across six controlled laboratory environments and two Panera Bread locations in the greater Cincinnati metropolitan area. Researchers measured soup temperature at intervals ranging from two minutes to forty-five minutes, and found, consistently, that the soup had cooled.
'What we're seeing here is a pattern,' said Dr. Flemming Bosch, the study's lead author and Chair of Hot Things Getting Less Hot Studies at the University of Northern Delaware. 'The soup starts warm. It then proceeds, over time, to become not as warm. We believe this is significant, and we want to be careful not to overstate what the data can tell us at this stage.'
Co-author Dr. Priya Sundaram was more cautious, noting that the findings, while 'directionally compelling,' should not be applied universally without further research. 'We studied tomato bisque, French onion, and a rotating selection of seasonal broths,' she said. 'We are not yet prepared to extend these conclusions to stew. Stew is its own environment. Stew has its own rules.'
The report, which spans 412 pages including appendices, dedicates an entire chapter to what researchers are calling the 'Post-Removal Cooling Phenomenon,' or PRCP, and includes seventeen graphs depicting soup temperature over time, all of which show lines going downward. A glossary in the back defines 'cooler' as 'having less heat than before.'
Not everyone in the scientific community is convinced the findings warrant the attention they have received. Dr. Harold Winn, a thermal physicist at MIT who was not involved in the study, reviewed the paper and described it as 'thorough.' He paused for a long time after saying this.
'I think the work is solid,' Dr. Winn said. 'I think the methodology is sound. I think they have confirmed something that I, personally, have been aware of since approximately age four, when I touched soup.' He declined to comment further, citing what he described as 'a need to go sit outside for a while.'
The research team is now seeking an additional $1.8 million in federal funding to conduct Phase Two of the study, which will examine whether soup that has been reheated returns to a warmer temperature, a hypothesis the team describes as 'promising but unverified.' A preliminary proposal submitted to the National Science Foundation notes that 'the reheating question represents a significant gap in the literature that the field is not yet equipped to responsibly address.'
A public information pamphlet summarizing the findings is expected to be distributed to community centers and soup kitchens nationwide later this quarter. The pamphlet's working title is: 'Your Soup: What We Now Know, And What Remains Uncertain.'