The Celsius (°C) scale is commonly used for everyday temperature measurements, while the Kelvin (K) scale is used in scientific research, physics, and engineering. Unlike Celsius and Fahrenheit, Kelvin does not use the degree symbol (°) and starts at absolute zero, the lowest possible temperature.
To convert Celsius to Kelvin, use this formula:
Kelvin (K) = Celsius (°C) + 273.15
For example, if you want to convert 25°C to Kelvin:
25 + 273.15 = 298.15 K
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You can check other values instantly with the online Temperature Converter.
Absolute zero (0 K or -273.15°C) is the coldest theoretical temperature, where atomic motion stops completely.
The Sun's core reaches temperatures of around 15 million K (15,000,000 K), while its surface is about 5,778 K.
The lowest temperature ever achieved in a lab is 38 trillionths of a Kelvin above absolute zero, recorded in a physics experiment using laser cooling.
Water freezes at 273.15 K and boils at 373.15 K, making the Kelvin scale easy to use in scientific calculations.
NASA uses the Kelvin scale to measure space temperatures, as it provides absolute values without negative numbers.
In the 19th century, William Thomson, later known as Lord Kelvin, studied the relationship between temperature and gas volume. He proposed that there must be a lowest possible temperature, which he calculated as −273.15°C—now known as absolute zero.
His work led to the creation of the Kelvin scale, which became the standard for scientific temperature measurement. Today, Kelvin is essential in physics, chemistry, and space exploration, helping scientists understand extreme temperatures across the universe.
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Converting Celsius to Kelvin is simple—add 273.15. Whether you’re conducting experiments, modeling climate data, or exploring outer space, precise temperature measurement is vital. For fast, reliable results, use robust online conversion tools.
