Answer :
Final answer:
The SI unit for temperature is the Kelvin scale, where 0K denotes absolute zero. This is equivalent to -273.15 degrees Celsius, according to the findings of British physicist Lord Kelvin. This scale is beneficial in scientific applications, including noting the freezing and boiling points of water as 273.15K and 373.15K, respectively.
Explanation:
The SI unit for temperature is the Kelvin scale. In this scale, absolute zero — theoretically the lowest possible temperature where all molecular motion ceases — is denoted as 0K. Comparatively, absolute zero is equivalent to -273.15 degrees Celsius, option A in your multiple-choice question.
The Kelvin scale was proposed by British physicist William Thompson, also known as Lord Kelvin, in the mid-19th century. The scale is based on the early scientific discovery that the volume of a gas would theoretically reduce to zero at this equivalent Celsius temperature. This makes Kelvin an absolute temperature scale, providing a more accurate measurement for scientific applications. For example, the boiling and freezing points of water on the Kelvin scale are 373.15K and 273.15K, respectively.
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