In a news release from the University of Georgia, Professor Travis Glenn interpreted the study for the public. Glenn, who was not directly involved in the study, said “Coronavirus lives a few days on many surfaces at room temperature, but it dies far faster at higher temperatures.” The aforementioned study noted that SARS-CoV-2 (the novel coronavirus) was similar to SARS-CoV-1 and that their responses to heat may also be similar. Glenn points out in the press release that “If you heat a material up to 130 degrees F, which is the high setting on a dryer or a very low oven setting, you only need about 20 minutes to kill greater than 99.99% of the virus.” At 15o degrees F or higher, it only takes about five minutes to kill the same percentage of virus. However, it may not be practical to throw your mask or package in the oven. The clothes dryer is a good alternative for the masks, but what about those packages?
According to Null’s website, “The atmosphere and the windows of a car are relatively “transparent” to the sun’s shortwave radiation (yellow in figure above) and are warmed little.” As you see in the graphic (or from your own personal experience), it is brutally hot inside a car left in the sun. Dark materials (dashboards, seats, and other objects) heat up significantly and then heat the air through the processes of convection and conduction. The objects also emit infrared (heat) energy. However, this automotive “greenhouse” effect could be useful in killing coronavirus according to Null.
Could Sunlight And Heat In Your Car Be A Weapon Against Coronavirus On Packages And Masks?
A more recent study by Grundstein also affirmed and extended these number. Null says that one place to get the heat required to kill the virus on a package might be the mask. However, it is important that only inanimate objects or products not sensitive to heat be considered for this practice.
Dr. Calvin Mackie is a renowned engineer and STEM ambassador. The founder of STEMNola told me, “I keep my mask on the dashboard of my car for this reason.”