The quantity of biryani that can be cooked in a 10-litre pressure cooker depends on several factors, such as the recipe you're following, the ingredients used, and the serving size. However, I can provide you with a general estimation.
Typically, the rule of thumb is to fill a pressure cooker up to two-thirds of its capacity to allow for steam and pressure buildup. This means that in a 10-litre pressure cooker, you can safely cook around 6 to 7 liters of biryani.
Keep in mind that the quantity of biryani may vary based on the specific recipe you're using, the type and amount of ingredients, and the desired consistency of the dish. It's always a good idea to refer to the recipe instructions or consult with an experienced cook for more precise measurements.