I don’t think I understand how it can be hotter than 100 celcius.
I’m not defending McDonald’s here, they can rot.
Like, coffee is mostly water, and water boils at atmospheric pressure at 100c. Milk boils slightly more than 100. I guess the lid would pressurise the steam a little? Maybe the coffee grinds hold the heat far more than the water? I wouldn’t have thought it would be diluted too much to make a difference.
I guess this is a stupid question, because it happened. But how can boiling water cause third degree burns in the quantity of 500ml? I thought it’d have to be much more than that and very prolonged?