what is the boiling and freezing point of water on Kelvin scale
The Correct Answer and Explanation is:
Answer:
- Boiling point of water on the Kelvin scale: 373.15 K
- Freezing point of water on the Kelvin scale: 273.15 K
Explanation:
The Kelvin scale, developed by Lord Kelvin, is an absolute temperature scale used primarily in scientific calculations. This scale begins at absolute zero, the point where molecular motion theoretically ceases. It aligns with the Celsius scale in terms of interval size, meaning that a one-degree change on the Celsius scale equals a one-Kelvin change on the Kelvin scale. However, unlike Celsius, the Kelvin scale does not use the degree symbol and does not go below zero.
Water, a common reference substance in temperature studies, has key phase change points used to define various temperature scales. On the Celsius scale, water freezes at 0 °C and boils at 100 °C under standard atmospheric pressure. To convert these values into the Kelvin scale, the fixed value of 273.15 is added. Therefore, the freezing point of water becomes 0 °C + 273.15 = 273.15 K. Similarly, the boiling point becomes 100 °C + 273.15 = 373.15 K.
The significance of using the Kelvin scale lies in its ability to express thermodynamic temperatures without negative values. This proves especially important in physics, chemistry, and engineering disciplines, where absolute temperatures are required for formulas and laws such as the ideal gas law and thermodynamic calculations.
The use of Kelvin also provides clarity in interpreting scientific data, especially when comparing temperatures across systems or when conducting experiments that rely on precise thermal measurements. It supports standardization across international research and industrial settings, eliminating confusion that might arise from regional variations in temperature scales. Thus, the Kelvin scale serves as a vital tool in modern science for ensuring accurate and consistent temperature readings.
