This is the classic experiment, first performed in 1847 by James
Joule, which led to our modern view that mechanical work and
heat are but different aspects of the same quantity: energy. The
classic experiment related the two concepts and provided a
connection between the Joule, defined in terms of mechanical
variables (work, kinetic energy, potential energy. etc.) and the
calorie, defined as the amount of heat that raises the temperature
of 1 gram of water by 1 degree Celsius. Contemporary SI units
do not distinguish between heat energy and mechanical energy,
so that heat is also measured in Joules.
In this experiment, work is done by rubbing two metal cones,
which raises the temperature of a known amount of water (along
with the cones, stirrer, thermometer, etc,). The ratio of the
mechanical work done (W) to the heat which has passed to the
water plus parts (Q), determines the constant J (J = W/Q).
This is the classic experiment, first performed in 1847 by JamesJoule, which led to our modern view that mechanical work andheat are but different aspects of the same quantity: energy. Theclassic experiment related the two concepts and provided aconnection between the Joule, defined in terms of mechanicalvariables (work, kinetic energy, potential energy. etc.) and thecalorie, defined as the amount of heat that raises the temperatureof 1 gram of water by 1 degree Celsius. Contemporary SI unitsdo not distinguish between heat energy and mechanical energy,so that heat is also measured in Joules.In this experiment, work is done by rubbing two metal cones,which raises the temperature of a known amount of water (alongwith the cones, stirrer, thermometer, etc,). The ratio of themechanical work done (W) to the heat which has passed to thewater plus parts (Q), determines the constant J (J = W/Q).
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