What Is the Freezing Point for Celsius? Simple Answer
The freezing point of water on the Celsius scale is 0 degrees Celsius (°C). This is the temperature at which liquid water turns into ice under standard atmospheric pressure (1 atm). If you are asking “what is the freezing point for celsius,” the simple answer is exactly 0 °C.
Why 0 °C Is the Freezing Point
The Celsius scale was originally designed around water. In 1742, Anders Celsius proposed a scale where 0 represented the boiling point and 100 represented the freezing point Wikipedia. Later scientists reversed the scale to the version we use today, setting 0 °C as the freezing point of water and 100 °C as the boiling point. The modern definition, established by the International Bureau of Weights and Measures, defines the Celsius scale in terms of the Kelvin scale, where 0 °C equals 273.15 K BIPM.
For a quick example: if you have a glass of water at room temperature (roughly 20 °C) and place it in a freezer, the water will begin to freeze once its temperature drops to 0 °C. Impurities like salt can lower the freezing point, which is why salt is used to melt ice on roads.
Key Takeaways
- The freezing point of water on the Celsius scale is 0 °C at standard atmospheric pressure.
- This value is a fixed reference point that defines the Celsius scale, with 100 °C as the boiling point.
- The Celsius scale is part of the International System of Units (SI) and is used by most countries worldwide NIST.
- Impurities in water can lower the freezing point below 0 °C, a principle used in everyday applications like de-icing.
