The junction semiconductor temperature sensor shown in the figure is used to measure the temperature of hot air. The output voltage $V_\circ$ is $2.1\;V$. The current output of the sensor is given by $I=T\;\mu{A}$ where $T$ is the temperature in $K$. Assuming the opamp to be ideal, the temperature of the hot air in $^\circ{C}$ is approximately _____________.
