Payloads: Cool Flames Investigation with Gases:  A crewmember replaced the Manifold #4 fuel bottle with a new bottle containing 100% Butane. Cool diffusion flames were discovered during droplet combustion experiments aboard the ISS in 2012, and this initiated a rapidly growing field of combustion research. A cool flame is one that burns at about 600 …

Source: ISS Daily Summary Report - 9/22/2021