One hundred degrees Celsius is the boiling point of water at standard atmospheric pressure. At this temperature, water transitions from a liquid to a gas, forming steam. This is a crucial point in cooking and various scientific processes, as it indicates when water is hot enough to cook food or sterilize equipment. In the metric system, Celsius is a temperature scale where water freezes at 0 degrees and boils at 100 degrees. This scale is widely used around the world, especially in scientific contexts, making it essential for understanding temperature-related phenomena in fields like meteorology and chemistry.