Does food bake more quickly in a glass container than in a metal one?
Yes, This is because the transparency of glass allows radiant heat to pass directly through it, absorbing comparatively little of that energy in the process. Cooks using a recipe based on figures for a dark-surfaced pan and baking in one made of ovenproof glass must either shorten the baking period or lower the oven temperature by 10oF. When the recipe is designed for a shiny pan and you use a Pyrex container, decrease the temperature 25oF.
