Sorry, I was referring to the specific examples you provided. While those flames would indeed look different, those differences would be completely overshadowed

Sorry, I was referring to the specific examples you provided. While those flames would indeed look different, those differences would be completely overshadowed by the differences in exposure. In one case you have flames that are _completely_ blown out (due to the dark surroundings), and in the Slow Mo Guys video the camera has been set to capture the details of the flame. There are absolutely differences between various flames burning in various conditions. When it comes to burning hydrocarbons (propane, methane, kerosene, gasoline, etc), that difference has more to do with the fuel/air mixture than it has to do with the specifics fuel. It is a lot easier to get a good fuel/air mixture when burning a gas like Propane. When a pool of liquid is burning, it is almost impossible to get a good mixture of fuel and air (even with a bunch of fans), so it is burning fuel rich, resulting in a lot of unburned fuel intermixed with the flame. I would suggest Periodic Videos recent video about the bunsen burner. They achieve both sorts of flames you're talking about with a single fuel source (methane). https://www.youtube.com/watch?v=in9BGz958jg https://www.youtube.com/watch?v=in9BGz958jg