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During the measurement a constant electrical effect passes through the conducting spiral, increasing the sensor temperature. The heat generated dissipates into the sample on both sides of the sensor, at a rate depending on the thermal transport properties of the material.
The dissipation constant is a measure of the thermal connection of the thermistor to its surroundings. It is generally given for the thermistor in still air and in well-stirred oil. Typical values for a small glass-bead thermistor are 1.5 mW/°C in still air and 6.0 mW/°C in stirred oil.
To quantify the ease with which a particular medium conducts, engineers employ the thermal conductivity, also known as the conductivity constant or conduction coefficient, k. In thermal conductivity , k is defined as "the quantity of heat, Q , transmitted in time ( t ) through a thickness ( L ), in a direction normal to a surface of area ( A ...
It allows parents to check the child's temperature even while in a different room.
The constant of proportionality is the thermal conductivity; it is a physical property of the material. In the present scenario, since T 2 > T 1 {\displaystyle T_{2}>T_{1}} heat flows in the minus x-direction and q {\displaystyle q} is negative, which in turn means that k > 0 {\displaystyle k>0} .
The heat flow can be modelled by analogy to an electrical circuit where heat flow is represented by current, temperatures are represented by voltages, heat sources are represented by constant current sources, absolute thermal resistances are represented by resistors and thermal capacitances by capacitors.
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The experiment has laid the foundations for the extension of the validity of the Landauer principle to the quantum realm. Owing to the fast dynamics and low "inertia" of the single spins used in the experiment, the researchers also showed how an erasure operation can be carried out at the lowest possible thermodynamic cost—that imposed by the ...