A temperature sensor has a sensitivity of $31$ micro$-$Volts$/,$ i$.$e$.$ for each degree difference in the junction temperature, the output changes by $31$ micro$-$Volts.

The sensor is used in a measurement system that has a $28-$bit ADC with a range of $0-6\mathrm{.}8$ V$.$ What is the smallest change in temperature $($in the units of m$)$ that can be measured with this setup?

Write your answer in decimal form with two digits to the right of the decimal point $($e$.$g$.5\mathrm{.}39)$; do not write any units or any symbol; just write the numerical value.