Measurement and Effects of Heat — Science STD 8 — Question
Maharashtra BoardEnglish MediumSTD 8ScienceMeasurement and Effects of Heat5 Marks
Question
How are the different units of temperature-related?
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Answer
1. The SI unit of temperature is the kelvin (K). Temperature is also expressed in °C (degree Celsius) and °F (degree Fahrenheit). $\begin{aligned} & \frac{F-32}{9}=\frac{C}{5} ; K=C+273.15 \\ & \therefore F=\frac{9}{5} C+32=\frac{9}{5}(K-273.15)+32\end{aligned}$ Here, C denotes temperature in °C, F denotes temperature in 0F and K denotes temperature in K (kelvin). [Notes: (i) The unît degree Celsius is named in honour of Anders Celsius (1701 – 44) Swedish astronomer. He devised a temperature scale in 1742. (ii) The unit degree Fahrenheit is named in honour of Gabriel Daniel Fahrenheit (1686 – 1736) German physicist. He developed the mercury thermometer and devised the temperature scale. (iii) The unit kelvin is named in honour of William Thomson, 1st Baron Kelvin (of Largs) (1824 – 1907) British physicist and electrical engineer. He made significant contribution in thermodynamics and electromagnetic theory. He proposed a scale of temperature now known as the Kelvin scale or thermodynamic scale.]
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