1°C, or one degree Celsius, is a unit of measurement for temperature in the metric system. It is commonly used in most countries around the world to describe how hot or cold something is. The Celsius scale is based on the freezing point of water at 0°C and the boiling point at 100°C under standard atmospheric conditions. In everyday life, 1°C can make a significant difference, especially in weather conditions. For example, when temperatures drop to 1°C, it can lead to frost formation, affecting plants and animals. Understanding this temperature is essential for activities like farming, weather forecasting, and clothing choices.