(i) Give the relationship between centigrade (ºC) & Kelvin (K) Scale.
(ii) why temperature in Kelvin scale have positive values?
(iii) How Charle’s law explain the concept of absolute scale of temperature?
Answers
I) The relationship between the celcius and the Kelvin scale is -
Temperature in °C = Temperature in Kelvin (K) - 273
Change in celcius = change in kelvin
II) The Kelvin scale starts from 0K which is the absolute zero (-273° C).
Temperature donot go below the absolute zero and therefore we get only positive values on the Kelvin scale.
III) The absolute scale of temperature is the temperature where 0 is taken as the absolute zero.eg - Kelvin.
Charle's law states that volume of a gas varies directly with the temperature under a constant pressure.
The plot of the Charles law showed a line on the graph with intersected the negative y - axis at a temperature of -273° C. Due to this a new absolute scale with -273 °C as the starting point of a scale was used . 0 K (-273 K) is the starting point of the Kelvin scale and is a absolute scale of temperature.