A constant volume gas thermometer shows pressure readings of $P_1$ at the triple point of water and $P_2$ at the boiling point of water at 1 atm. What is the ideal gas temperature corresponding to a pressure reading of $2P_1$?

Which of the following is the SI unit of temperature?

The freezing point of water on a thermometer is marked as ${20^{\rm{o}}}X$ and the boiling point as ${150^{\rm{o}}}X$ . A temperature of ${80^{\rm{o}}}C$  on this thermometer will be read as

What is absolute zero in Celsius?

The freezing point on a thermometer is marked as ${20^0}C$ and the boiling point as ${150^0}C$. A temperature of ${60^0}C$ on this thermometer will be read as

The freezing point on a thermometer is marked as ${20^0}C$ and the boiling point as ${150^0}C$. A temperature of ${60^0}C$ on this thermometer will be read as

Which of the following properties of a thermometric substance is NOT essential for practical thermometry?

Very low temperatures are measured by

A pyrometer is calibrated to measure temperatures in the range of 500°C to 2500°C. Which of the following is NOT a valid reason for choosing a pyrometer over a thermocouple in this temperature range?

Recently, the phenomenon of superconductivity has been observed at $95\,\,K$. This temperature is nearly equal to

Which temperature scale has no negative values?