The SI Unit of temperature is Kelvin. The Kelvin scale is an absolute scale, meaning that it starts at absolute zero. Absolute zero is the point at which all thermal motion ceases. The Kelvin scale has no negative numbers, so temperatures can only be expressed as positive values.
The Celsius and Fahrenheit scales are both relative scales, meaning that they each have an arbitrary starting point (0°C and 32°F respectively). These scales also have negative numbers to represent temperatures below their respective starting points. Temperatures on the Celsius and Fahrenheit scales can be converted to one another using simple formulas.
Temperature measurements are important in many fields such as meteorology, atmospheric science, oceanography, physics, chemistry, materials science, and engineering.
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