An ideal thermometer should have

$A$ Centigrade and a Fahrenheit thermometer are dipped in boiling water. The water is then cooled until the Fahrenheit thermometer reads $140 ^\circ F$. The corresponding drop in temperature as recorded by the Centigrade thermometer is ...... $^\circ C$.

What is absolute zero temperature?

What is the triple point?

On the centigrade scale,the temperature of a body increases by $30$ degrees. The increase in temperature on the Fahrenheit scale is ..............

The temperature of a body on the Kelvin scale is $x \ K$. When the temperature of this body is measured with a Fahrenheit thermometer,it is found to be $x \ ^\circ F$. Then $x = $......