ICSE BoardEnglish MediumSTD 9CHEMISTRYStudy of Gas Laws2 Marks
Question
Define absolute zero and absolute scale of temperature. Write about the relationship between °C and K.
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Answer
Absolute zeroThe temperature of $-273^{\circ} \mathrm{C}$ is called absolute zero. $ \mathrm{V}=\mathrm{V} \cdot\left(\frac{273+\mathrm{t}}{273}\right) $ Volume at $-273^{\circ} \mathrm{C}=\mathrm{V} \cdot\left(\frac{273-273}{273}\right)=0$ Absolute or Kelvin scale of temperature The temperature scale with its zero at $-273^{\circ} \mathrm{C}$ and each degree equal to one degree on the Celsius scale is called Kelvin or the absolute scale of temperature. Conversion of temperature from Celsius scale to Kelvin scale and vice versa The value on the Celsius scale can be converted to the Kelvin scale by adding 273 to it. Example: $ 20^{\circ} \mathrm{C}=20+273=293 \mathrm{~K} . $
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