Home » UPSC CDS-1 » If $x$ is the temperature of a system in Kelvin and $y$ is the tempera

If $x$ is the temperature of a system in Kelvin and $y$ is the tempera

June 1, 2025 by rawan239

If $x$ is the temperature of a system in Kelvin and $y$ is the temperature of the system in ${}^\circ\text{C}$, then the correct relation between them is

$x = 273 - y$

$x = 273 + y$

$x = 173 + y$

$x = 173 - y$

This question was previously asked in

UPSC CDS-1 – 2020

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The Kelvin and Celsius scales are two common temperature scales. The relationship between a temperature in Celsius ($y$) and the corresponding temperature in Kelvin ($x$) is given by the formula $x = y + 273.15$. For most practical purposes and in common examinations, this is often simplified to $x = y + 273$.

The Kelvin scale is an absolute temperature scale, with 0 K being absolute zero. The Celsius scale is a relative scale where 0°C is the freezing point of water and 100°C is the boiling point of water (at standard atmospheric pressure). A change of 1 degree Celsius is equal to a change of 1 Kelvin.

The formula $x = y + 273$ implies that a temperature of 0°C is equivalent to 273 K, and a temperature of 100°C is equivalent to 373 K. Absolute zero, which is -273.15°C, is equivalent to 0 K.

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