Sherlock Holmes bent down over the box, rummaged around it and took the ordinary medical thermometer.
Watson looked at this “relic” with curiosity.
– My dear friend, here is the unique device. With its help I determined temperature of almost boiling liquid.
Watson examined the thermometer.
– Dear Holmes, but, allow me, the scale of this thermometer is calculated only for 8 derees Celsius. Begins with 34 °C and comes to the end at 42 °C.
– I did not make a reservation, dear Watson, it was as I said.
How can one determine temperature of almost boiling liquid using the thermometer with such a scale?
It is necessary to take cold water of the known weight and temperature. Then one can lower the thermometer into the water.
Into other vessel (graduated cylinder) it is necessary to pour hot water. Adding hot water to cold water and carefully stirring it with the thermometer, mixture must be brought to such temperature at which the medical thermometer will begin working.
Knowing the mass of cold water, the weight of hot liquid which was added and also the initial temperature of cold water and, using the reference book on physics, it is possible to calculate temperature of hot water easily.
© Elkin V. Physical tasks of Sherlock Holmes. 1997