Which one of the following is the lowest possible temperature ?

[amp_mcq option1=”0° Celsius” option2=”– 073° Celsius” option3=”– 173° Celsius” option4=”– 273° Celsius” correct=”option4″]

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UPSC NDA-1 – 2021

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The lowest possible temperature is absolute zero, which is defined as 0 Kelvin. On the Celsius scale, 0 Kelvin corresponds to approximately -273.15° Celsius.

Absolute zero is the theoretical lowest possible temperature where particles have minimal vibrational motion. The Celsius scale is related to the Kelvin scale by the formula $T(K) = T(°C) + 273.15$. Therefore, 0 K = $T(°C) + 273.15$, which gives $T(°C) = -273.15$. Among the given options, -273° Celsius is the closest value to absolute zero.

The Fahrenheit scale also has a zero point, but it is not absolute zero. The relationship between Celsius and Fahrenheit is $T(°F) = T(°C) \times \frac{9}{5} + 32$. Absolute zero (-273.15°C) is approximately -459.67°F.

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