Find the value of $-197^{\circ} C$ temperature in Kelvin. (in $ K$)

The pressure of a gas filled in the bulb of a constant volume gas thermometer at temperatures $0^{\circ} C$ and $100^{\circ} C$ are $27.50 \, cm$ and $37.50 \, cm$ of $Hg$ respectively. At an unknown temperature,the pressure is $32.45 \, cm$ of $Hg$. The unknown temperature is ........ $^{\circ} C$.

Explain different scales of temperature and write the equation for their relationship.

$A$ thermometer graduated according to a linear scale reads a value $x_0$ when in contact with boiling water,and $x_0/3$ when in contact with ice. What is the temperature of an object in ${}^oC$,if this thermometer in contact with the object reads $x_0/2$?

The correct value of $0^{\circ}C$ on the Kelvin scale is ........ $K$.

It is difficult to cook rice in an open vessel by boiling it at high altitudes because of