Paper bowls can be suitable for serving soup, but their effectiveness can vary based on the quality and thickness of the paper material. Thicker and more durable paper bowls, specifically those designed to handle hot liquids like soup, are generally better suited for serving this type of food.
However, it's important to note that paper bowls, especially thinner ones, may not insulate heat as effectively as traditional bowls made of ceramic or other materials. They might become soft or weaken when holding hot liquids for an extended period, potentially leading to leaks or spills. For hot soups or liquids, it might be advisable to opt for sturdier or insulated paper bowls explicitly designed for serving hot foods to avoid any issues with leakage or heat transfer.