.25 litres boiling water

Water is a colorless, odorless liquid compound of hydrogen and oxygen (H₂O) that exists in various states across the Earth. In culinary practice, boiling water—water heated to 100°C (212°F) at sea level—serves as a fundamental medium for cooking, extraction, and preparation of foods and beverages. The boiling point may vary slightly with altitude and atmospheric pressure. Boiling water is essential for dissolving soluble compounds, denaturing proteins, sterilizing ingredients, and creating specific textures in cooked foods.

Boiling water's high temperature makes it an effective solvent and heat transfer medium. It is used to steep tea leaves, dissolve instant products, cook grains and legumes, blanch vegetables, and poach proteins. The thermal energy of boiling water facilitates hydration, softening, and flavor extraction in countless culinary applications.

Boiling water is one of the most fundamental cooking mediums across all culinary traditions. It is used to brew tea and coffee, cook pasta and grains, rehydrate dried ingredients such as mushrooms and legumes, and blanch vegetables. In soups and stocks, boiling water dissolves gelatin and extracts flavors from bones and aromatics. It serves as the base for broths, infusions, and poaching liquids. Many instant foods—from instant noodles to powdered soups and desserts—require boiling water for preparation. Boiling water also sterilizes equipment and cools rapidly when needed for temperature control in cooking.