Coffee Molecular Science-what is the difference between light roasted coffee and heavy roasted coffee?

Coffee Molecular Science-the difference between light-roasted coffee and heavy-roasted coffee in general, coffee on the market boasts that coffee is fragrant and mellow, and some good coffee emphasizes that acid is great. What is the difference between roasting and roasting? what is the difference between the explosion of coffee beans and the end of the explosion? it is called shallow roasting at this time, the variety of coffee beans, growth altitude, growth soil, mountain surface.